I'm also with you. A lot of factors can make one system sound better than the other...but in a perfectly controlled experiment (both perfectly tuned, perfect proper lavs, same environmental situation, I would doubt theres a difference in quality that anyone would notice...at least anyone that employs you will notice. Ive never had an editor ask me "Hey, were you using that 211 system again?"
That being said, if its true that the range is better with a 211 system, (not saying it is, but Ive heard this) and if cost is an issue, I would prefer the 211 system with a fresh tune up. Use some of the the $ saved for this tune up, and put the rest of the $ saved towards other gear you may need.