If you want to go cheap, grab a thinkpad T510 ($200 on ebay right now). It is the first of the series to use a full led backlit LCD. It is also lighter than it's older brother the T500 and T61. If you want to spend more money, then get the T520. Anything after that (T530, ect) I do not have experience with. The slim 'x' series laptops are good too as well as the carbon series. But I like the bigger screens on the T series.