Here's a tip.. as anti-social as it may be.. LOCK YOUR DOOR whenever you know you're not going to be in your room for a bit. Any contents insurance will NOT cover you if they find out your door was open and something happens. Most halls have a common area or kitchen/lounge that's shared so use that to be social is my advice 😉
My student contents insurance (Endsleigh, included in my rent) actually covers a desktop computer, but not a laptop. So do check that as well - I had to add a laptop onto it (but it wasn't especially expensive to do so).
I realise this stuff is all very boring but you really do want to make sure if you get a computer you plan to treasure 🙂 Of course, contents insurance also covers accidental damage which is the thing I worry about even though I'm as careful as careful can be.
I was working from a Windows laptop hooked up to a screen and I personally found it a bit cumbersome as it took up more space than a desktop would've (it was a 17" laptop mind you)... so I've actually just dumped that and now I have a shiny iMac, BUT I also got a 13" MBP too for portability, heh. I travel around a lot and also want the laptop for lecture notes.
I was the only person in my class last year who would type notes on a laptop but we were categorically told it was allowed, so I do it. I love it because it means I get so much more down during classes. I'm not noisy with it and the MBP keyboards are very quiet. Also for this purpose, the new MBPs have great battery. I'd get the base model 13" MBP and look at upgrading the memory and HDD in the future if it's something that interests you (it'd be much cheaper to do it that way, it's what I plan to do too).
But yeah I can't wait to get back home either and work on my iMac. The screen is just beautiful and sad as it is, I kinda miss it. If I could only get one though it would have been the MBP as it makes more practical sense. (I worked for a few years before uni so I could splash out a bit more heh).
Best of luck and enjoy your new purchases! By the way, you get the same discount in an Apple retail store as you do online through the university network as people are talking about but obviously if you're not at uni yet you can't access the discount through them. In your shoes, best to go to an Apple retail store (or maybe try ringing them too), with a copy of your UCAS acceptance letter etc, maybe you can give those details over the phone but I suspect if you're not in a physical shop you'll have to send them proof off some way or another.
It seems the printer rebate has stopped in retail shops now - either that or the Apple store in Bentalls Centre, Kingston, was lying to me... but I think you can still get it online though, as said, you might have difficulty with that as you can't prove your future student-ness. (The discount you get for being in further, rather than higher, education, is far worse).
Buying online though does get you free three year apple care I believe, whereas in a retail store you have to pay about £46. The online apple care doesn't extend the telephone support for three years though, it's just the extended warranty, whereas what you buy in store (and DO GET IT! either way, you can only get it at that price when you buy your Mac, otherwise it's about £200 for a MBP...) is the full monty as it were.
There's the free iPod offer too. A bit misleading - it's actually a rebate of up to £145 so it depends how expensive the iPod is as to whether it's free. I went for a 120GB classic so I'll only have paid £30 for that.
The printer/iPod offers are via rebate - you'll need to cut out labels and such from your pretty boxes and mail them off 🙁