Unfortunately, the number of different model names is vast, not to mention confusing. The 2.33GHz T7600 and 2.4 GHz T7700 are among the best. In the sub -�800 category, you may as well have to make do with the older Core Duo. These chips are dual-core and pack plenty of performance, so it's not much of a comprimise. For performance, these chips are significantly superior to the Pentium M and Celeron ranges.
Memory: The minium offering in both categories should be 1GB, although a number of laptops offer 2GB . The more memory you have, the smoother your laptop will run.
Hard drive: It's difficult to upgrade a laptop's hard drive, so get as much storage space as you can. If you're buying a desktop replacement, go for at least 120GB. If you'll be using it in addition to a desktop, you may not need as much, but get at least 80 GB.
Games: When shopping for a more expensive laptop, the best solution is probably the nVidia GeForce Go 8600M GT, although the Go 8400M and ATI Mobility Radeon X1600 also offer plenty of performance. If you're splashing out in excess of �800, you shouldn't settle for less than this. At the cheaper price level, you may just get a Go 8400M or 8600M, although you're more likely to have to plump for a Go 7400 or 7300. If you're interested in gaming capabilities, don't go below the 7400, and don't settle for an integrated chip such as the RTI Radeon Xpress 200M.