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I am running AC on a LAPTOP that I carry with me...it's a totally wireless setup, with this the "main" computer, then others tie in through the network. So I can't attach a second HDD...and I am not sure if I have the technical ability to put a larger one in, if that's possible with the laptop I have.

You can change the hard drive on a laptop pretty easily usually. Almost all manufacturers have easy access cover on the bottom usually with 2-4 screws to access the hard drive/ssd. Unless you have one of those unibody laptops (e.g. macbooks). I hope you are using disk encryption on there. Actually there's quite a few disk imaging software programs that will let you transfer it live to a new ssd before you even hook up the new one. (Macrium Reflect for example). I've had to move my SSD two times already. 64GB -> 128GB -> 256GB now. Works pretty well. After 500GB, the prices get pretty high. I can only think of one player that offers an affordable SSD at 500GB+. It was just released a few days ago too. The Crucial M500 at 960GB for $600 USD. In the sub 500GB range, there are lots of good choices: Intel 520, Samsung 840 Pro, Plextor M5 Pro.