Cache required by 7 Home Premium 64-bit?

Is there any information available anywhere covering the basic cache use of Windows 7 Home Premium 64-bit? I'm talking when it's running in the Background, without Windows based tasks also running, for simplicity.

Quick background information; I've just bought a Custom PC which has a 32MB Cache on its 500GB HDD, and intend to use it for gaming. I'm trying to decide whether to stick a cheap HDD in for Windows 7 to run on alone, leaving the Cache to my games and applications. However, I've heard 32MB is quite good (feels weird saying that about computers, haha), and obviously the cost of a HDD could easily buy a game or two. So, if anyone has any idea, please could you help me? :)

Thanks in advance,
Callum. :)

PS: All information on my Profile is the new PC, not this one. That one will run Windows 7, this runs Vista.
PPS: I'm really sorry if this is in the wrong place, I have checked and couldn't see a better Forum. I have read the rules. If it's some sort of test of reading,

"Abusing the PM (Private Message) system with any of the above, or sending PMs to members for Windows 7 related help instead of posting it in the forum."

This should have "is not allowed" or "Please do not" or similar attached to it.
PPPS: This seems to be quite a new Forum. Nice job on getting so well ranked on Google so quickly. :)

Thanks Jonathan. :)

That was really helpful, thanks. I'll stop panicking about getting another Hard Drive by christmas then. :)

Yep, I'm aware of Solid State but it's just too expensive right now.

I was most likely going to look for a cheap SATA HDD with about 40GB storage (just to be safe) and at least whatever Cache you guys would recommend.

I'm pretty sure I'll be alright without, but if I can I'll probably still go for it, just for simplicity. Depends on Windows 7's recommended cache. :)

EDIT: This PC was bought from scratch and is shipped with a blank HDD. No worries about re-installing programmes or anything, nothing's there except for what will come with Windows 7. :)

Yep, I appreciate this isn't essential, but the aim is to harness the power of the PC nicely.

I just hoped someone would know of a rough cache I should give Windows 7, so I could work out whether or not to buy the second HDD. :)

EDIT: In other news, my System Specs are now more detailed. :)

I'd buy one hard drive for Windows and your games and move the page file to another hard drive if you want. Otherwise just one hard drive is enough - choose the right one. You need one with dense platters, decent read/write times and a fat cache. That said most 500GB hard drives have 16MB caches. I bought a Seagate Barracuda 7200.12 1TB / 32MB cache with 2 500GB platters providing the space. The denser the better. Thats enough for any games.