There are many, Red's just came out with a 321 and one of the guys at the track had one there on Saturday, he said he really liked it. I run an OS AD3 but still learning how to tune it!...
If you plan to race it, .21 is ROAR Maximum for Buggies (up to .28 for Truggies). Truggies also allow for a larger fuel tank (150cc Max.) for those larger engines, so running .28 in your buggy is going to reduce run times (125cc Max tank).
Please keep us posted.