IBM Laptop are the best use this link for a discount price:
http://www-131.ibm.com/webapp/wcs/st...catalogId=-840
Dual Core offer more power and should be better. IBM is offering them so I would think its ok. But I don't know if its worth the extra cost. Dell always tries to get you to buy the newest and higher priced item.
I would by a IBM and pay 20% more for it.