There's so much on the market that it's hard to list everything. I'll cover a few though.
ESC/Motors
Motors
Conversion Bits
Lipos
Use your Trakpowers (provided they are the 4900mAh 25C ones), and wire them in series to get 14.8V, 4900mAh capacity. You need the higher capacity and discharge (C) rating to be able to run a high power brushless set-up (you want to aim for about 100A Continuous and 200A burst with 4S)
None of the lists are in any particular order, just as I thought of them.
My personal choices would be:
Conversion Bits: RC-Monster, Tekno RC haven't got a Hyper kit
ESC: Castle Creations Mamba Monster Max, simply because it is proven to work in such a variety of set-ups. Also the Castle customer service is excellent, and they have an excellent warrenty. Also, if you blow you're ESC up by doing something stupid (like connecting the batteries up the wrong way and turning it on), the most they'll charge for repair (even if it needs a whole new ESC) is $70.
Motor: Either one of the Castle motors, a Medusa or a Tekin.
Hope this has helped.