A few years ago, I bought a brand new mid-2010 Macbook Pro from an Apple Store. It was the 17" screen and I had it upgraded to 8 GB of RAM, all else was stock...
At the time, it was pretty damn fast even without an SSD. It could handle anything I threw at it, including games (thanks to the dedicated GFX card).
But, while I was happy with the performance I found it entirely too bulky to use in a variety of situations (IE, non-portable). My work desk didn't have enough room to comfortably set the laptop on, it was unwielding to put on my lap, not comfortable at the coffee shop or cafe.... almost impossible for me to use in the bed at night... You get the point.
I recently needed an Apple again (I had sold that one) and was stuck with a decision between Macbook Pro and Macbook Air.
I chose the Air and haven't looked back.
Moral of the story... if you truly need a dedicated GFX card, go with a MacBook Pro or Mac Pro. If you do not, the MBA will most likely suffice.