Psst...don't buy it from us. (Don't tell them I told you.
Amazon, Newegg, Buy, and CDW are all authorized vendors and usually have it for less than the MSRP (although not all of them appear to have 2010 on the shelf yet).
As far as problems, I haven't had any (and I've been running for 3+ months now in beta), but then again I'm not in production-mode anymore. Parametrics and freeform modeling cause the most trouble, and they're not in LT. Also, we don't have a bona fide beta program for LT, so it'll probably be a while before real feedback starts rolling in.
If you want to connect to the internet, you should be able to -- I don't know of any internet or AV-related problems. (With LT, that is.)