Hmm, I'm pretty undecided haha. I prefer the oldschool keyboard on the x220, and the 3.3GHz I'm pretty sure is turbo boost.
The way I see it, the only thing that the x230 does better is having a HD4000 iGPU instead of a HD3000 (something like 20% better) and slightly more power efficient -- but I'd probably trade that for the keyboard -- I can't deal with a chiclet keyboard after I had the mechanical one on an X201 I think.
Oh, I don't actually take it to the university! It's just where I lived around the uni was 4hrs away from where my parents' house is, so I got lots of weird looks travelling around london with a PC tower, 22" screen, suitcase, a couple of duffel bags and a rucksack to and fro
Ah, sadly that listing has ended, but it looks pretty good. Being in the UK means that I'd have to pay a fair bit in import charges though, and I don't really feel like I need the i7, having an SSD and running linux makes it much faster anyways!
EDIT: Yep, the x230 processor is 2.6GHz/3.3GHz Turbo, the x220 is 2.6GHz/3.3GHz Turbo. I think both are the best i5s of the 2nd/3rd gen. Looking at the specs, they're very similar but the 3rd gen is slightly better.
This is the x230:
http://www.ebay.co.uk/itm/Lenovo-Thi...wtbpBjkfCWhl3Q
And this is the x220:
http://www.ebay.co.uk/itm/Lenovo-Thi...0AAOSwv-NWbYEV
I'm tempted to get the x220 because it looks to be in much better condition, and with the money saved I'd be able to buy the IPS screen straight away! (EDIT: Plus, apparently the x220's have better build quality)