iMac for gamers

[Maximus38]

Although I've always loved Macs, thought they were far superior in terms of design and reliability, I've been a PC owner for the last 9 years.
Part of this has been due to the fact that they're relativey easy and cheap to upgrade, and partly because of the one big advantage they have over Macs - gaming.

With the arrival of Boot Camp, for the first time I can see myself buying an Apple, even though Windows in all its guises is a dog, it will run games like Oblivion.

My question is: if I buy an iMac, how easy is it to upgrade? My PC only has an Athlon 2.0 processor from about 4 years ago, but I've added RAM to about 1.25 Gb, and added a better graphics card. I see that the iMac only has 512Mb of RAM, probably not enough to run a game like Oblivion.
Buying a Mac Pro is not an option - it has to be an iMac, but before I buy, I want to know:

1. How much would it cost to upgrade to 2Mb of RAM?
2. How easy is it to install RAM on an iMac?
3. Would it then be capable of running high-spec games eg Oblivion using BootCamp?

Thanks for any suggestions

 

[plinden]

1 Examples:
Crucial
OWC

2. See for yourself - http://docs.info.apple.com/article.html?artnum=303084

3. Oblivion is not available for the Mac, so you'd have to run it in Windows.

 

[Maximus38]

Thanks for the advice and links
I'll probably wait until the New Year when Leopard (hopefully) will be out, but at least that gives me an idea.