anyone recomend descent leakdown tester?

Smoke on decel is almost always valve guides.

I noticed Harbor Freight sells a leakdown tester for about $40, but I'm not sure how "decent" it is. I built one for about that and while I'd be reluctant to say it's accurate to more than +/- 5% it works fine as a basic diagnostic tool. Plenty of info on the web on building your own.