Afternoon , The 2001> compact is all E46 including suspension. So you can actually unbolt and fit eveything from an M3 CSL if you wish. (I belive someone has)
I test drove a 325ti Sport about 6 months back. Great car, really nimble and enough power to put a smile on your face. Certainly an improvement on the last compact and not as 'whiz-pop-bang' as a Civic Type R.
I used to have a 325ti and agree they are great cars. If you're looking at one and doing a fair few miles, i would suggest getting the face lifted version with the 6speed gearbox. Apart from that, i don't think you could go wrong...