I work for HP so I could be biased.
I don't think either will be good for playing games because the graphic card would not be that good.
Get a pc instead, unless you really really need a notebook
I'm using NC6000 at work and it's been fine.
I believe Compaq Presario V2000 is the same as HP Pavilion dv1000, and they should be fine as well.
If you want wide screen, get the Presario. If not, nc6000 should be fine.
NC6000 is the business model, so you may find parts easier to find and could be cheaper.
So far, I've noticed issue with NC6000 to be batteries, or motherboard to be faulty - but is not that common.
If you're thinking of getting Dell, please get the extended warranty, or prepare to ditch it after 2-3 years.