you dont need a super powerful pc for recording im using a
0.8ghz processor
128mb ram
dual screen (added the second one today its well cool) set
and the only thing restricitin me at the moment is the sound card and mic. but im plannin on spending a bit of money and upgrading big time soon
this pc is 7+ years old so alsong as yours is newer you shouldnt have of a problem

those line 6 thing look pretty damn good they have the toneports now too im guessing they do a similar thing as guitarport
recording software i use magix audio studio which took a while to get used to but is quit easy to use.