Hard to beat a Sig Kadet for a trainer. The Kadet series is what everyone else is compared to.

I would advise a different engine than the O.S. LA series. While the LA is OK, there are better engines for the same cost. Try a Thunder Tiger Pro series of the same size. You get more power, and a much better carburator (easier adjustments) for about the same price as the LA. THe Magnum XL series is another decent choice. A better engine is the O.S. FX series, but the cost is much higher.