I have MBP given to me from work. It is 2.4Ghz C2D with 4GB RAM. Should I just upgrade the RAM to 6 and go on using this MBP? Or should I upgrade to an I7 MBP with 6GB? I am leaving my job and get this MBP for $1500.- and upgrade to 6GB for $150.- I can also buy a newer I7 MBP for $2550.- What do you guys think? Right now, everything works nicely on my MBP except NI Komplete 7. I have a few instances of Kontakt and Logic bogs down. If I use EXS, my MBP is more than enough.