So I have a MacBook Pro 15 but I think it was a mistake to buy it in the first place, I should have bought an iMac, because I like to have a lot of applications open and the MBP15 cannot handle it, and I need a bigger screen. How many hours have I wasted impatiently waiting for the application to respond and force quitting applications! I am not sure what to buy, iMac or Mac Pro (used). I thought maybe if I bought a used Mac Pro I might be able to get a faster computer for cheaper than iMac? What monitor should I buy for MacPro that could match the iMac resolution? Also I love the resolution for the new MacBook Pros 15 and 17inches, is the same resolutions available for separately sold monitors of any brand?