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I've gone through a few chips, and one was bought through BD, which I now use as a "spare". I run a 4 position chip, of which they now have a 6 position chip, which is a MUCH better option, than the BD X Power option in my opinion.
There are several other vendors who sell these multi-position chips as well, and so long as they have a top notch programmer, will all be good options for you.
It is nice to have a "tow" program, perhaps a "high idle" if you wish, and a couple of "POWER" programs..or even an "economy" program if you like.
Go with a multi position chip, as I'm positive you won't regret your decision.