It looks like you're new here. If you want to get involved, click one of these buttons!
Honda Civic Si vs. VW GTI
GTI = 1.8T, 2 doors, 180hp/174 lb-ft, nice interior, 18 cu. ft of storage, 24/31 mpg, 17" wheels available, leather available (for those that care about that sort of thing), lots of standard equip.
Si = 2.0L, 2 doors, 160hp/130 lb-ft, ~2700lbs, [not sure on storage], ~ 24/31mpg, 15" wheels
The Si will probably have the edge in terms of out-of-the-box handling, shifting, and [possibly] reliability [but the 4yr/50K warranty by VW seems to offset any main concerns I might have], the VW has a proven engine that is used in a plethora of vehicles, nicer interior (based on Si pics I have seen), an armrest, and is probably less susceptible to theft (the last two are my own personal biases).