Hehehe. I'm 36 Shredder and I've been playing for about 25 years. I live in the Phoenix Arizona area after I moved here from LA. I retired from playing for a while but now with PC home recording, the internet to take the power away from the record companies, and new innovations such as Line 6, I figured I'd record the "shredder" instrumental CD I always wanted to.
Let me tell you about the POD. It's a direct box that doesn't require an amp to mike. It simulates 32 different amps. Just like if you had all of those amps, you can set the pre-gain, gain, tone, reverb, and other onboard effects like chorus, flange, and delay. You hear yourself through your headphones or your studio monitor. And, what you hear is what goes down on the recording. You could be playing and someone could open the door to the studio and, as long as it didn't mess you up playing the song, the recording would still be good. So, basically, you plug into this little kidney shaped box, set your sound, and press record. No micing, no noisy effects, just pure sound.
I have a friend who just has to surround himself with Marshall cabinets old style (he was a big Kiss fan growing up). He absolutely cannot be convinced not to plug into a Marshall. But, after he heard my little Spider practice amp produce a bigger better sound than his stacks, he decided to go out and get the POD Pro. Its a rack mounted unit that uses your amp as a preamp and then lets you use the POD Pro like you would the POD. The only real difference is that you're using your Marshall or Boogie or whatever as well.
I'd suggest you go to a good music store and demo the Line 6 stuff. Line 6 also makes a head and cabinet that looks like Marshall, Boogie, etc. called
a Flextone. If you want an amp to use both in the studio and live, that would be your best bet. It sounds as awesome as the POD but its an amp.