Personally I use an Aspire V3-551-X419 for gaming:
AMD A10-4600M @ 2.7Ghz, Turbo to 3.2Ghz,
Radeon HD7660G built into the APU,
Radeon HD7670M 2GB (2024MB) in asymmetric crossfire with the HD7660G
Wireless a/b/g/n
6GB ram
750GB HDD
It runs modern games at medium to high settings... It's a bit cheaper than what you have in mind... but is distinctly the lesser machine.... Might still work of you want a cheaper machine as the game you mentioned has quite low requirements, but if you aren't very good with computers it'll be worse as getting the asymmetric crossfire to work with older games can be a challenge.
It's right on the cutting edge now, so it should last a fair while... though note that it's based on the second generation APUs, which are set to be replaced by the 3rd generation ones any day now... so you'll lose out a bit there.
Also I found it needed a cooling pad.
I can't think of any other gaming laptops that are reasonable of the top of my head (In that price range)
The Core i5 probably won't do you very well..... It's already relatively old - look for an intel i7, AMD A8, AMD 10, or at least an 'ivy bridge' i5.
Best of luck to you, either way