if you're asking the "should i leave it stock or mod it?" question, and changing your answer daily, my suggestion is to get a cheap car (both as a base car and cheap to modify) and mod it and get that out of your system, lol. i am actually serious... i took this approach and my BMW is still stock (except for wheels) whereas the MR2 that i bought at the time was my outlet for "tinkering" and it served me well.
to answer your question, i had my ST185 stock for about 2 years. and then i had no other cars to mod (i am still not modding my BMW and not touching my Lotus), so i needed an outlet for "tinkering" once again. so i'm doing some minor suspension upgrades to the celica now (1/2 way done) and restoring the interior (almost all done). full details:
http://alltrac.net/phpBB2/viewtopic.php?t=22973
and oh, my car runs!!!!
drove it a few weeks ago, in fact...