OMP has a GREAT 540 profile. The kit is only $60. They come out about 4 lbs with a stock servos and a 5 cell pack. 2 or 4 stroke is only a few oz apart.

Harriers are very solid and its really easy to hover too. On the 3 rd tank i was doing tail touchs for the first time on any plane!!!! Builds real fast, all sticked up. i could write a book on how good it is but i wont bore you.

Click on the www on the bottom to see mine.

Hope this helps