Hi
Just some idea's thrown out there
What are you looking for in a laptop? I see you want aluminum frame, quad core and discreet GPU... is that all? what about budget, since you mentioned the mac book I guess you have some $$$ to spend.
If you are looking for a gaming notebook then the MSI GT Series GT60 0NC-002US Notebook Intel Core i7 3610QM(2.30GHz) 15.6" 12GB Memory DDR3 1600 1TB HDD 7200rpm DVD Super Multi NVIDIA GeForce GTX 670M is $1286 at Newegg something along those lines have everything a gamer needs @ 1920x1080.
BUT that is NOT an ultrabook, its a fat gaming notebook and it looks it.
I really like the ultrabook idea but it is far too expensive to find a gaming book. (if thats what you need)
http/www.newegg.ca/Product/Product.aspx?Item=N82E16834152375
Acer makes some great ultrabooks (at least they appear that way when I check them out at the store, never had one come into the shop) and I was always satisfied with there notebook quality control.
Just some ideas...
Fungi