I think the helmi_c/ImCokeMan 1.1 (now 1.2?) is the cleanest base rom we've got - it's what every other 3.5 custom rom is based on, so any bugs in it are in them (unless fixed by those developers already, and if so those fixes should be easy to roll into the base)
But as you say, it's up to them. I'll identify the issues in any rom they tell me to look at
