What prices are the configs you are comparing?
Do u have a strong preferance when comes to mobility, graphics?
I assume the ibm will cost more foe a comaprable config.
8600
- wide screen
- option of internal dvd burner
- no serial or parallel ports
Ibm r50
- I would bet on a ibm any day on surviving a fall over sony, dell etc
- i like the idea of storing a pda in the modular bay.
ibm r50
- better wi-fi capability. ( not to sure about this, friend explained something about their antennas)

If your game alot i feel the 8600 is the machine for you,
If you are like me, a play a game a week its a tough choice especially if you don't have specific features in mind or a price consideration.
For a desktop replacement that you want to be able to carry around with a kick ass wide screen display, i would go for the 8600, I would consider an ibm if i wanted an ultralight, ultracompact, rugged machine.
sorry i'm not really helpful, they are both top brands and im sure either will make a good choice.