How useable is a Hackintosh?

Im considering building a dual booting mid end gaming PC/Hackintosh to put on my desk on a sub 1000 budget. The key specs are:

One of the Mini ITX motherboards

The latest gen 3.1ghz Intel i5

and an AMD 7850 (or its equivalent with the new gen of GPU's)

These are the key specs i'd need to worry about whilst making a hackintosh, correct?

My other question was, how authentic does a Hackintosh feel? If I hid the box under my desk, and used a cinema display, apple keyboard and trackpad, would i be able to tell between it and my MBP? I probably wouldn't be using the Hackintosh side for anything to intensive, Just iphoto, safari and maybe a bit of Logic Pro.

Thoughts?