I just added a 3pk radio to my car and a bls451 servo, and saw my lap times drop BIG TIME!
A-Main just had the bls 451 for $90 last week - I race VTA, and it was absolutely worth the money! I put together a spreadsheet comparing a bunch of hitec, futaba, KO Propo and one Orion 1007 weighing price against performance and weight and all that fun stuff and for the money, I couldnt be happier.
The Orion 1007 was my second choice, but I heard some nasty things about the Savox brand (they are re-branded Savox).
And what B_E said is true - the servo it replaced was an Airtronics 93148 (circa 1998)