eHLT HERMS coil type preference

Which would we prefer for the coil in a HERM system?
1. 50 ft 1/2" stainless coil
Or
2. 25 ft 5/8" convoluted copper coil http://morebeer.com/view_product/17515/102206/Convoluted_Copper_-_5_8"_x_25_ft

I put 3/8 copper tubing in mine because I had an immersion chiller I could cannibalize. I regret it - I really wish I had 1/2 inch in it. all my other fittings are wide open 1/2" - camocks, valves, etc. That coil really slows the flow down - not so much that my system doesn't work well, but enough to bother me.

I don't think the convoluted coil makes enough of a difference that it's worth getting - from the reading I have done.

if I replace my coil I will go with 1/2" tubing. go with the stainless

You do not need a 50 ft HEX coil. 25' of 1/2" is plenty IMHO. Also, mount it as low as possible so that it's still submerged after you run off your strike water.