I have a somewhat decent soundcard already in my computer, it's a Creative Audigy abet old though I can record at 6ms delay straight in according to guitar rig.

Would I get the a good clean tone with a preamp such as the M-Audio Buddy Preamp

or would I just be better off buying a Pod Studio?

...hooked straight through Guitar Rig until I get a decent Amp.
I've got the POD UX2 which has served me beautifully the entire time I've had it. I've had a couple other interfaces that have allowed me to multi-track record to seperate tracks simultaneously, but everytime I'm recording a single track, I find myself going back to my little old Line 6.

Honestly, for bedroom recording, it's about perfect. You can't hear money spent when upload the song.