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Your problem is reversable speed controls are neither small nor cheap.
I'd reccomend the Novak Rooster. It's $70 @ Tower, handles down to 15 turns, and about as small as you can get in an inexpensive reversible ESC. If you don't want to spend that much, need something smaller (this should fit snugly in the HPI Rally. I've seen them used in the RS4 sedans) or if you intend to race competively (reverse is not allowed in organized competition, that's why you don't see many of them), I'd suggest the Novak ExplorerII. $50, also handles 15-turns, and has the bonus of having a hookup for a brakelight set. That would be kind of a cool feature on a rally car.
I used Novak, and Tekin products, and I had reliabilty issues with a Tekin Rebel. It is their cheapest reversing ESC, and unlike their more expensive ones it uses inexpensive foreign labor. Also the heatsink is glued on, which is also a concern regarding reliabilty. That speed control died in it's first good crash.
Even the inexpensive Novak speed controls are made in the USA, and have removeable heatsinks. I used a Novak Racer EX in many different cars for several years, running 10-13 turn motors, and never had any issues with that speed control.
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