I haven't really decided yet. The finned ones are fairly labor intensive. Probably around 4 hours machine time start to finish on one. I have another 5 of the hosts coming in and I was going to do a batch and see how much I could get that time down to before deciding.. since how long it takes really sets the price.
As it stands, it'd probably be right around $100 for host+finned aluminum heatsink + knurled aluminum focus ring for it to be worth my time. For copper heatsink, add $25, for brass focus ring instead of AL, +$5... But.. like I said. If I can start doing them quicker, the price will drop some.