My main PC is a dell laptop. I've had it for 2 years now without only one problem (CD drive failed). Having said that one of my house mates' Dell laptops failed several times and had to be sent back. Eventually they just sent him a new laptop (dual core as well, the bastard).
If you're going for a desktop I highly recommend you build your own instead. I built one last summer which is just awesome and was great value for money.
Don't forget our IRC: irc://irc.irchighway.net/#slackers
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WhiteAcid - your friendly, very lazy, web developer