My main cash league was established back in 1995 & has basically kept the same set of rules (with minor adjustments) since 1999. Here is a basic overview:
12 team, 5x5 (BA, HR, RBI, SB, OBP, ERA, W, SV, K, WHIP)
(C, C, 1B, 2B, 3B, SS, UI, UI, OF, OF, OF, OF, OF, OF, P (x9)) DH qualify as OF
No bench. 10 Add/drops per season (unlimited DL/ML slots; these moves do not count against you).
One issue in the league is that closers are virtually worthless. Everyone drafts closers during the auction with the upper tier guys barely exceeding $10. Then I feel like it's a mad dash to get a lead in the category. If you don't get to 75th percentile you can begin to dump closers and and chase Wins and Strikeouts (sacrificing one category to prosper in two). By August, there will be 10+ closers sitting on waivers.
We passed a couple of new rules for 2014 that would replace SV with SV+HD and another that would cap IP at 1500 innings. Is this enough or have other leagues you've been in do something different? I had thought about replacing K and K9 as well or somehow using some more new age stats to help balance out the scoring categories. I attempting to replace OBP with Walk Rate to no avail.
I'm interesting in receiving some feedback. Hopefully not too many of my league mates are completely stuck in their ways.