I will be selling my 3GS to pay for my iPhone 4 (which is pre-ordered). What do you guys think? Should I try to sell now, Craigslist, ebay, etc. and put my sim into a cheap phone I already have laying around the house? Or do I wait until my new iPhone 4 shows up on June 24 (crosses fingers n toes) then try to sell? What would/are you gonna do?