I'm not a hackintosh hater.But I do hate when some people try to have the best OS, without paying for it.Anyway, if you want then just try hackintosh.But the problems of lag (maybe) will remain in leopard OS.
Now, you're starting to ask difficult questions :D
Sit somewhere, grab a beer, and then you could look here: http://www.plaisio.gr/Laptop-Netbook-GPS/Notebook/Laptop/with%28Manufacturer=Apple%29.htm
Cheers! Be a mac follower today!!! YOU CAN! :D
-Blane