Personally I would sell everything and use the proceeds to buy the Gridseed ASIC Scrypt miners instead.
That's just my personal opinion.
But gridseed cost 6000$ for only 6mh/s. When KnC will come, gridseed can come to toilet :-) (i think). For GPU is x11 or n-scrypt.
You pay under $1900 for 3500-4000 KH/s, easily. Dunno where you go that number from.