I could use some help from all of you Pro's out there. I am trying to find an engine for my buggie. But I don't race I just bash. I have chosen the following engines, so can you give me real world opinions. I want smmoth power, Reliability and easy to tune. I hope that is not asking for too much. When giving your opinions I also want to know that parts are readily available for the engine. I will be using a Jammin JP2 Pipe and the clutch that came with the kit.

1. RB concepts WS7 2
2. RB S7
3. Novarossi P5
4 Novarossi S421B
5. Collari LC21B7

Thank you to all in advance for your help.