if you look for the future or something, the RSX is discontinued after '06, so it will be worth more. Plus Acuras don't appreciate at all in the first place so resell is a big factor. The Si feels "beastier" if thats a word, but based on performance, they are both about the same.

Personally I would go with the RSX if I had the money. My friend bought a brand new '05 and I love the way it looks. Its all about the options though