My .02, get the VS for a mild build. You'll hardly notice the idle difference from stock. The XP is a decent cam, but for city driving it's going to be a waste. The S1X is an OK cam, but the idle doesn't sound rowdy like the XP, or stock like the VS...it sounds like the car has a bad misfire.
Basically, the VS acts a lot like a rocker car, it is torquey down low, but still has better top end than stock. This is because it allows higher cyl pressure than the XP, whereas you'll need to pulley down with the XP to get the grunt back. I've driven in several XP cammed cars, and they're fast and all, but the street manners are much better with the VS cam for 0-50 mph unless you go with a little looser Tq converter or gearing...but you already have the 3.29's IIRC.
W/o an IC you'll still be limited on pulley sizing to an extent vs. the XP, but better than rockers. SO IMHO get the VS with stock timing chain/stock springs, and keep the revs under 6100rpm. W/o an IC would have good low 13 sec potential/12.60-70 with a 75 shot, and mid to high 12's with an IC.
HTH's