I use the Ebay silicone hoses at that joint. Haven't had an issue, and it's been on there for roughly 4 years. I don't think the EGT's are that high that far back on the pipe on our 2 strokes.
I have been using copper rtv for the joint lately. It's rated at 700 if I remember correctly. I have also used red rtv which is rated at 500. Neither has failed from heat so I would say a 500 degree rated hose should be ok.