You should prolly switch to new MBP coz that slide will be useful for DJs imho. Buy a $9 adapter on ebay for your cable troubles mate... Or just sell your old MBP on ebay, dont go to this trade-in stuff coz they are a robbery.

You must be joking, right? My $2500 (on ebay) used Macbook pro is calculated at $650 in this program. Not a trade, a joke...