I think the best question to ask yourself before deciding is, "What am I going to use this lapptop for?"
If the answer is that you want a desktop replacement, then go for something like a beefy Dell laptop with a docking station.
For desktop replacement, the docking station is the way to go, as you get the best of both worlds - desktop at home with a nice big screen and full keyboard. Then when you hit the road, you just pop the lappy out of the dock and you're good to go - no files to sync, etc..
The new top end Dell Laptops make for good gaming rigs, as well. (Although if it's strictly kick-ass gaming you are after, Alienware makes the mac-daddy gaming laptops, IMO)
This is also an ideal solution if you do web design, etc - as graphics manipulation, etc is a snap with this type of laptop.
If it's mostly mobile communications you're after (email, icq, skype, etc) then a low end lappy works quite nicely.
Thinkpads are another good choice - I know quite a few people that have them, and are quite happy with them.
No matter which lappy you buy, consider the following:
- Your main need/usage (Portability or desktop replacement? Graphics/Gaming or just email, communications, office apps, etc?)
- Network ability - most lappys have built-in wireless - look for Wireless-G. For the hardwire ethernet connection, try to get gig-ethernet.
- Bluetooth is a happy plus
- How much RAM can it hold? (you can never have enough)
- Your budget
- Service - does the manufacturer have a solid reputation for taking care of you when it all goes horribly awry?
Out of all of the above, I think service is overlooked too often. I can only speak for Dell (as my last thre lappys have been Dells) - their on-site service warranty is excellent cheap insurance. The mobo on my last lappy died, and Dell had a guy at my door the next day - he swapped it out on the spot in thirty minutes - good as new.
Best of luck to you on your search. =)