Which version of the slim PS2 has the best compatibility with PS1 games?

I've looked on the net with mixed results.

wikipedia is probably the best source here. Some of the newer models fixed some older compatibility problems but broke others (like the Lunar 2 example).

See "slim case design" under the wikipedia entry.

Well I'll get one in december and hope for the best. Where would be the best place to buy one from?

Also I'm getting a black one I don't like the silver one.

Target, Walmart since they have 90 days no questions asked return policy.

Right.