[expanding from the 8x in the opening post to 8x, 9x and 10x. Some good models are only sold as 10x]
From my past 3 years of looking at stuff under $250. I have put most of my money into 32mm and 40 or 42mm.
Audubon Vector 10x25 roofs
Not the worst little roofs, but not the sharpest. Felt like looking into a microscope, small eye cups
Pentax UCF WP 8x25 and 10x25 reverse porros
Based on the 10x25, which I saw, I think the 8x25 will be very similar to Nikon ProStaff 8x25. The 10x were definitely a bit dim, same as ProStaff. The 10x has a tripod mount if that is of interest. Nice diopter setting in middle, works. I compared the 10x to Monarch 10x42 that I had with me, and you just can’t see as much detail at distance with a 10x25. The Pentax has a tripod mount, but it did not help me. The detail of a 10x42 just was not there to see.
Pentax Papilio 8.5x21 reverse porros
I liked these otherwise, but they gave me easily blackouts. Bright and fairly sharp. I think the fun come with viewing things close by, butterflies etc, they look huge.
Pentax DCF MC II 8x25 roofs
I liked these overall. Bright, compact but fairly sturdy for double hinged (might last 5 years). FOV is a bit narrow. I did not like the 10x25, sweet spot is small, and only 5 deg fov. They are not worth your trouble, unlike the 8x.
Nikon ProStaff 9x25 reverse porros
I have these, I like them. Bright enough, 10x is dim. 8x is also good. Diopter on right side, extremely stiff.
Nikon Travelite 9x revers porros
Not water proof. I have a feeling they were a bit sharper than ProStaff 9x, but they had more flare.
Nikon Sportstar 8x25
Nice wide field for casual birding and other uses, not phase coated. Maybe the only non phase coated 8x25 roof available that is any good.
Cabelas Alaskan Guide 10x28
These were probably the best I came by. Not sure the 10x offers any advantage, but I was able to hold them OK for medium distance in the store. I predict I could ID a kinglet at a fair distance. Fov is only 4.9 degrees or so, so definitely a problem for birds fairly close. Also made in 12x, but no 8x.
Nikon Medallion 8x21 and Pentax 8x21 were also acceptable, nothing spectacular.
Bushnell Excursion 8x28
Acceptable, nothing amazing. The 10x28 had ridiculous small depth of field, not useable.
Bushnell Legend 10x26 reverse porro
Worse than Pentax 10x25. Nothing interesting.
Vortex Spitfire series
Not really worth the trouble, but try 8x if you need to see these non phase coated binoculars. Wait for Vortex Fury, check out 8x28 for about $230. Have not seen them yet.
Brunton Echo 8x25
I have seen it, and it was somewhere in the same category as Nikon Sportstar 8x25. Or possibly slightly better. It has been a few years since I saw them.
There are a few under $250 models I have not seen:
two Vortex
http://www.eagleoptics.com/index.asp?pid=4829
http://www.eagleoptics.com/index.asp?pid=4653
Leupold makes an Olympic 10x25, and I may have taken a quick look once, I do not recall them being exciting. FOV 262ft. Also 8x25.
A bit bulkier with single hinge, but I prediuct the Fury will beat the Pentax 8x25 roofs. I could live with either, they are just compact after all.
If bulk is not an issue, I recommend a good 8x32 roof over any on the list above.