Yeah one game doesn't mean a thing Jimmy, you know you shouldn't generalise like that.
Try running a game like Sacred 2 on an iMac with a 2600HD and you will see how even a relatively simple looking game looks like a dogs poop on such a system, and having seen the 360 version - it looks just as good as Sacred 2 running on an 8800GT.
Killzone 2 Demo looks and plays better than Crysis running on my Mac Pro with an 8800GT for example, simply because it is so optimized for its purpose.
A games console from my own experience will play games much better than an iMac (unless you plump for the more expensive model with the decent gpu), and you wont have to feck about with settings in order to get a playable experience.
I agree with this post. Also sure PC games can be found relatively cheaper, I a m a big reseller of video games, when I'm done, I resell via craigslist or amazon or whatever and get a large percentage of what I paid b/c I buy used games in the first place. PC games SUCK in this regard, most are unsellable or useless, steam games can't be resold, games for windows you lose the Live key although not necessary.
I like to game on PC but it cannot and will not be my only option. I also see many more technical errors when it comes to the PC gaming platform than consoles. There are more games that can be found for console exclusivity than vice versa. Consoles are just easy in the fact that you buy a console and you can play all the games made for it, with a PC you can buy a pc but not every game that gets put out on the market for PC can be playable, it's all IF you have this or upgrade that and hope you don't run into driver issues or etc etc.
and yess the Killzone 2 demo is only a taste of what's to come. Graphically very impressive, uncharted 2 I think/hope will top it in terms of graphics.
*edit* after re-reading the original post, he's basically asking questions that a PS3 would answer. For mainly gaming, you pay at least half the cost for a ton of stuff right out the box. Blu-ray is a great addition esp if you have an HDTV, 80GB HDD, wireless or ethernet, divx/xvid player, basically an entertainment system, upconvert DVD player, PSN network, a good library of PS3 titles.
w/ an iMac unless you have it, Windows, probably ram upgrade, a gaming mouse. At least $1000 just to play games? meh
anyway I'm done =P