ORIGINAL: B.L.E.
The Sig Kadet LT-25 trainer is a taildragger. Don't be put off by the fact that it is only a .25 size plane. Kadets are great trainers regardless of size. I converted my first trainer, a Kadet Senorita into a taildragger and it worked great.
The LT-25 is closer to the size of a standard 40 sized trainer.