I don't know if the price is fair or not. Decently low mileage for a 9 year old car, and it is in super cool Fusion Orange color, which is really sweet.
A couple of things you need to know about a GT. (this doesn't apply to the 09 or 10 GTs)
What gives the GT more power than the base is that at high RPMs (> 6000 RPM), a special cam action kicks in and gives the engine a 50% HP boost. This is referred to as "lift" You really have run up the RPMs to get the extra power. Doesn't really come in for typical driving, but nice when you really need it, and supposed to be quite a thrill when lift kicks in. If you tend to be an agressive driver, you would appreciate it. If you drive for maximum fuel economy, you may never hit lift.
Also, a condition of that extra power capability is that you have to give it higher octane gasoline. I think it needs at least 89, instead of the default 87 the base needs. This will make it more expensive to feed. Sounds like you have a non-trivial daily commute, so that may well be a factor for you. Do not buy a GT unless you are willing to give it the 89.
In general, the GT should be ok to drive. No idea what your manual transmission aptitude is, so it is really hard to say how well you will learn to drive it well. I jsut swapped cars to go from a base manual tranny to a base auto tranny, and honestly, I can't really feel any significant difference in effective power between the two. Also, the auto tranny in Vibes has been quite reliable, as has the 6 speed in GTs, the difference is that the clutch in the GT will eventually wear out and will need to be replaced. (especially if it takes you a long time to learn to drive stick

)
The cars seem to handle pretty well. If you need to drive in snow a lot, you would want to get snow tires
So I really can';t say if that is a good eal or a a good car for you, but I can say that I think you would be happy with a Vibe (most of us here are) and welcome to genvibe. Please keep us updated on what you decide to do.