You are looking at the same laptop i bought very recently.
Word of advice,You can haggle a little with Dell.
I picked the cheaper option then upgraded to a dvd writer and 1G of ram,and also asked for a recovery disc and windows disc.If i had paid online,it would have cost around £125.00 extra.I got the upgrades for around £65.00
There was a thread on PCA saying to phone and ask for the best price,this i done then haggled a little.
Free discs and £60.00 saved,now that what i call good service.
Just to add,im very pleased so far with the lappy..very quick and reliable and does everything i want it to.
Regarding your games,i would upgrade to the best you can afford.I do not use the lappy for games,so cannot really comment to much.
Good luck with Dell,im sure you will be impressed with the lappy.