http://www.teamdelsol.com/ ->has alot of info you should look into

first of all your gonna have to pick a year, there are small diffrences between pretty much each one with styling, slight motor changes, options ect.

in general, the VTEC is much rarer and quicker in the high RPMs, the dual overhead cam really makes a diffrence. The Si has somewhat less pickup, but runs on unleaded fuel instead of premium. you can take any sol to places that work on hondas, but getting parts cars are alot harder than finding things for a civic. the VTEC can end up costing a bit more to maintian higher end parts (the platnum spark plugs jump to mind for some reason) but most people who get one find it really worth it. if you find and dont want a VTEC, i will trade +cash possibly. no matter what you get, a sol is really fun, i have had both and really love each for what they are.