I went with 35 because I read that 55 could melt the housings. After I made the order I was reading that it really won't. So I can't really help ya there, personal preference... and I don't know what the extra $20 would get you since the light is off from the get go.
oh yeah, took a long time to show up from DDM, about two weeks, if not a little longer. Combination of them having a sale, and order from Japan the same time the Toyota BS was going on. It took a long time to get through customs (according to the friendly rep at DDM)