Good info, here's a little more...

Bonito/Toro Nero

14.5mm cranks & extra long stroke engines. They are 7 port engines and the Bonito has the extra balanced crank. In general, these engines make the most power especially in the mid-range and top end. The news for 2011 is that new version, the Bonito, gets great mileage. Billy Easton is using this one on both his Buggy and Truggy. 12+ minutes.

Plus4 et al

14mm crank & long stroke engines. They're all 4 port engines and come in many flavors. The 2011 engines BTT & BTTS make a little more power AND also get better mileage (12-14 minutes on 30%) than the 2010 C Team. 12+ minutes on 30%. The Plus 4 C Team is still a very popular engine and a great engine for the price. The T & Buggy versions are the older versions and are a great value. For example, the Plus 4 Buggy has a street price of about $229. All Plus 4 engines are known for there smooth power band and great mileage. Most consider them the mileage king.

P5

14mm crank & also long stroke. This engine was the gold standard that all engines were compared to for many years. The new version has been updated with a better carb and lowered lighter cooling head.

Let us know if you have any other questions.