You are going to get a lot of different answers, by my opinion is the interstate battery. I've used interstates for years and get a good 5 years pit of them. First Gen interstate battery even has the plug for the battery light.
I'm looking for a set up that will have a mic only and no ear buds or speakers covering up my ears. As Long Tail stated, I just well use my 3/4 helmet. I rather use the speakers in the dash and just have a mic.
I really like the Elite II's before but since they were discontinued I had to go with the Elite III's. I like the III's but may not get 20K miles on the like I did on the II's.