I've got 6505+ 112, and I'd like to record it with my shure sm57, so I'm considering POD UX1.

Is it worth to collect some more cash for UX2? I don't want no simulations or whatever, I just want to record pure amp sound. I don't think I'm gonna ever use the second guitar slot anyway.

What do you think?
im not completely sure, but i think that, other than the extra input options, they're exactly the same.
Ux2 has a second mic and intstrument inputs aswell as meters for monitoring input levels I believe. If I recall correctly it also has phantom power which you need for condenser mics.
Agile AL3000
Douglas WRL90
J&D Strat
Squier Tele
Sammick TR2
Douglas Draco
Peavey JSX
Bugera V5
Id reccomend an interface that isnt aimed at guitarists if you wanna use it to mic up your amp rather than into the instrument jack. Better quality mic preamps.

Have a look for the focusrite, presonus, digidesign, avid, tascam usb interfaces.