Pull the trigger or not

So basically a week ago got one of the high end MAC BOOK PROS BRAND NEW FOR 2K on craigslist love it,my 4 year old desktop below i want to sell and get a new imac 27 inch with the gtx 780,the i7,and 512 storage,should one wait to get it or get it now?my only issue is buying now and of course bam retina version comes out in sept/oct if a new one is coming out then of course i can wait,suggestions?

http://www.youtube.com/watch?v=gPAKdpmzcm4&list=PL8CD45DF75C685E65

 

Also which ram should i buy getting 8 gb but wanna max out the imac not paying there crazy ram prices

 

• 3.5GHz Quad-core Intel Core i7, Turbo Boost up to 3.9GHz
• 8GB 1600MHz DDR3 SDRAM - 2X4GB
• 512GB Flash Storage
• NVIDIA GeForce GTX 780M 4GB GDDR5
• Magic Trackpad
• Apple Keyboard with Numeric Keypad (English) & User's Guide
• Accessory Kit


Ordered =)