Yeah, I read the reviews on that and they seemed pretty polarized... either five stars and endless praise or one star and a 'can't believe I fell for it'.
Since I can't seem to find any mini ITX power supplies with enough juice I guess a new case is what I'd have to go with

How difficult would it be to transfer the motherboard to a fullsize case? (I could probably, maybe, get some help with it) Or if I transferred over to a case with a similar form factor. (something like
this, same general measurements (deeper tho) and a 450W PSU)
Man, this slimline is so not worth it
Edit: Or I guess alternatively I could just go with a low profile GT 220, which recommends a minimum of 12v @ 18 amps, and try the 220W PSU I found on newegg that has a output of 12v@18A...