Thanks, I will check into them.
Here's a short primer on the differences between roof prism binoculars and porro binoculars. You should know something about what you're purchasing even if you're only spending $150 instead of $2400 like some birders have on the latest "alpha" roofs (yes, that's the correct # of zeroes!).
http://www.birdwatching.com/optics/binoculars2_porro_roof.html
You didn't give the model or configuration (magnification and aperture) of the Carson, so it's hard to recommend what could replace it, you might be happy with the 6.5x32 Fury for close in birding and for butterflies, but might find it lacking for birding at medium to long distances where you may not be able to see certain field markings on birds.
For close focus, roof prism binoculars are generally better, because the barrels are close together and the field of view doesn't collapse as easily into two overlapping circles like porro do at close focus.
OTOH, what roof prisms, and midsized roof prisms in particular, lack is the better depth perception and 3-D views of porro prism binoculars, and they are usually not as bright as porros at around the same price point.
The lower power 6.5x32 Fury should be better in those respects than the 8x30 model (compare the reviews on Eagle Optics to see what I mean).
There are trade-offs between roofs and porros and between lower power and higher power binoculars at all price points. Just a fact of life you have to live with! Hence why you need to know a bit about optics to make the best choice for your needs.
Besides the optics, there are the ergonomics to consider, how well they fit in your hands and how well the ergonomics make the bin easy to steady the image.
You mentioned there will be a lot of "close up birding" at the event your going to... unless it's a nature center with birds in a cage, you won't be seeing too many birds at 6 to 7 ft, which is a good close focus for a binocular.
Birds are shy. Except for the chickadees, none of the backyard birds who see me every day feed them sunflower seeds, suet, bread, and water, won't let me get that close.
Birds in the wild are usually even more cautious. So unless you plan to watch butterflies and aren't fair weather birders who only go birdwatching when it's sunny out, if you want to try to ID birds at a distance or just want to enjoy how they look from farther away than 7 ft, you will probably want to move up to 8x42 binoculars eventually.
Some have ridiculously close focus for that configuration, but the trade off is usually poor depth of field.
So my advice, with just the tidbits of information I have from your posts, is to keep the Carsons for close in birding since they seem to work well for that and buy a pair of 8x42 bins for all around birding.
At $150, porros are you're only good choice for full size bins, you will have to dig a little deeper for a decent quality full sized roof prism bin. Roof prism bins are generally a bit more expensive, though there's not as much gap in price as there once was.
Here are two recommendations from what I've tried:
In porros, the Nikon 8x40 Action EX. Sharp, bright, with a wide FOV. Close focus is not that great at 16.4 ft, but you have your Carsons for close in birding. For sharp views at a distance and under less than ideal lighting conditions, the Nikon will prevail. Ample sweet spot but fuzziness at the edges. The one downside is the weight, which is 30 oz. Personally, I prefer a bit of weight to help me steady the view, but not everyone appreciates that much weight around their neck.
http://www.amazon.com/Nikon-7238-Extreme-Terrain-Binoculars/dp/B0001HKIJK
The one inexpensive roof ($154) that I could recommend is not full sized, but a bit bigger than midsized 30-32mms - the Pentax 8x36 NV. It has a better close focus at 9.8 ft. It's almost 8 ounces lighter than the Nikon (due to a polycarbonate body). It won't be quite as sharp or bright, but your wife may prefer them to the bulkier porros.
http://www.beachcamera.com/shop/product.aspx?sku=PK8X36DCFNV#aReviews
The review doesn't sound good, but the guy isn't even a birder or hunter, he's a construction foreman. I wouldn't go by that. He needs a higher power bin but apparently doesn't know it.
There may be sample variation, but the unit I tried was easy to focus, comfortable to hold, and gave surprisingly good views for its price point.
One question. Why is your user name "Jersey" when you are from Ohio? Then again "Eddie from Ohio" isn't from Ohio either.
Brock