Choosing A Windows 7 Edition For My MacBook Pro, HELP !

Hi,
I have a MacBook Pro (early 2011), It came with Snow Leopard but I purchased Lion from App Store. Now I want to buy and install Windows 7 Home Premium (with bootcamp) for gaming but have a few questions? First of all I want 64 Bit but does it compatible with Lion and should I prefer it for gaming instead of 32 Bit? Other than that I found two packages on Amazon, which one should I buy? Can I install this cheaper version to my MacBook Pro, or do I have to buy the exprensive package? Thanks...

Microsoft Windows 7 Home Premium with Service Pack 1, 64-bit, English, 1 Pack, DSP OEI (PC) (This OEM software is intended for system builders only): Amazon.co.uk: Software

Microsoft Windows 7 Home Premium, Full Version (PC DVD), 1 User: Amazon.co.uk: Software

Buy the first one - "The OEM System Builder's" as it's a full install and less expensive than the MS boxed copy. And, select the 64 bit version to install in order to get full use of all your memory. It's compatible with Lion. Also, and this is important... when you run the Boot Camp Assistant, it's going to direct you to download a driver disk image from Apple which you then must burn to a CD or DVD. That will be your driver install disk.