Don't really know what you're talking about wanting one for the "power"?
You can't even find a pre-configured Toshiba notebook with anything much better than the 2.0 Ghz CPU and a screen resolution of 1280 x 800 instead of 1440 x 900 on the 15". Just went to their site, and to compete with a MBP I was up to $1549 for a 15.4" Tecra and they still must be embarrassed by the graphics in the thing because they don't even tell you which NVidia chip is in it nor even the mention of how much VRAM.
HP was not much better. The model starting at $1000 has the 2.0 Ghz chip.
The model starting at $1,200 only has the 2.26 Ghz chip. The rest only go down from there.
And funny how those are the same starting price points for the MB and MBP's with those CPU's.
You want power, yet you say you're going to save for a notebook? Better save a bunch, cause you're not going to get anything better than that 2.66 sitting in your iMac for less than about $1,600-$2,000 from any manufacturer including the ones that sell $400 notebooks.
Or, if you want some nice gaming power, how about the Alienware 15", 1440x900, 2.8 Ghz, 512 MB 9800GT, 4 GB RAM and only $3,349.
Sounds to me like you need to do some more homework in real comparison shopping. And if they don't start off with the same CPU, there is no price comparison that can be made as it and the motherboard are the 2 most expensive items in the case on most computers.
Even a build your own half decent gaming system right now with the low end Core i7 with good motherboard and power supply is going to run you $1,200-$1,300 minimum. And still no keyboard, mouse, webcam, monitor or any of the other little extras.
Like spending 20% of your computing time just keeping the thing virus and spam free, tweaking the services settings, keeping all your drivers up to date so you can even play that new game, keeping almost every single windows app from loading it's junk into startup so now it takes you 2-3 minutes to boot, etc.
And all this from one who is considering building a new Win box right now. But, you need to know what's out there and do your homework before you just take off on some "feeling".
I'd be willing to wager that for every 2-3 computers you can show me that are less expensive than a Mac, I can show you one that is more expensive.