I have an option to trade my desktop i7 for an Acer 8920 with full spec. I get to keep my SSD and my 24" LCD though.
Does it sound like a good idea? I don't need a poweful desktop PC as I don't game at all. Being mobile does make sense although the 8920 is a beast of a machine. It does have warranty until 2012 as well which is a bonus.
T9300 processor
4GB ram
2 x 320GB HDD (will replace one with my SSD)
18.4" screen
9650Go GFX
And all the usual stuff laptops have.
That's not really a mobile machine, more of a desktop replacement. It's heavy and probably has very poor battery life. So keep that in mind. If you want a fast yet low power draw CPU a C2D ULV processor is what you need and 18.4 inches is huge for a laptop, rather keep an external display handy and you can even power 24 inches if you want.
Acer is also a brand I would avoid.