i'm planning to get an electronic stringing machine and i've got my eye on the pro's pro tx600a. similarly priced machines that i've seen are pro's pro challenger with wise 2086 and eagnas combo 3800 modified with a wise 2086. being a total newbie to stringing, is there anything in particular that i should be looking out for with these machines? the only obvious difference i can see is the wise tensioner. the tx600a is the cheapest but is it a good buy? i don't mind spending more if it gets me a better machine rather than buying cheap and regretting later. thanks for any advice.