I will probably have some games on mine also. It is for college work but it will be the only laptop my parents get me until i get my own... so i want to get the very best. i have debated about putting windows on the system... I am not sure if it will be necessary for me though as games are shifting toward mac (Sims 3). I wouldnt use my computer for hard core gaming, I would use my PS3. But I could see myself using it for games like the Sims or internet games or movies and downloads. I also have tons of programs open at one time for my own convenience and this PC cannot keep up.
If you have the means to get a MBP get it, you'll be glad you did (better specs, better screen). Plus, if you are looking at the possibility of keeping it for a long time (4-5 years) it's definitely the way to go as opposed to a MB.
My rule of thumb is if you buy the "best" you'll rarely be disappointed with it.