$300 used prem, or $400 new?

Well lately i've been dying for a X360 on account of the Halo 3 beta, and i was wondering, what would be a smater decision buying a used X360 prem with only a store warranty of 30 days, or a brand new one for $400 with Microsoft's year warranty?  I myself work at a gamecrazy in Arizona and by far the X360 is the system most defective system around.  So what's a smarter buy? Should i take the $100 dollar less gamble?

Thanks! 

I never buy used systems, that's just my MO. I'd spring for the new one. Plus, it's like Christmas when you open a new 360.Staryoshi87

400$ for the new one. Better to have the warranty.

Since many 360 break over a period of time I wouldn't buy a used one. Get a new one.

Ps: Does the used ones come with a warranty?

1. make sure that everything is good or great condition 

2. make sure that everything is included

3. get a insurance, or a warranty

Get the new one.  With all the xbox's out there getting banned there is a possibility you could end up with one of those.  Not a good thing.

Avoid the used one, go for the new.