I am considering getting my son a MBP so he can create music via GarageBand. I currently have a maxed out mid-2010 17" MBP. However, since he is only 10, I was thinking the 13" will be sufficient. Thoughts on this and also what processor to get. Will the entry level 2.4GHz be enough? He will be using this with his Yamaha keyboard and digital piano via USB and with a microphone for his sax. BTW, he has been using GB on his iPad 2, but I thought the MBP would allow him to capture and possibly do more. Am I off base here?