It's easier for me to get left wing feathers, so I shoot left helical. But then I shoot a big 2 blade broadhead. If you're going to go with a mech head, I'd suggest a straight offset. The mech head wont need stabilization like a big 2 blade fixed head and helical will also slow the arrow some compared to the straight offset. All you have to keep in mind is, that no matter which helical or offset you decide to go with, you will need to use the proper wing feather. For instance, if you want to fletch left, you will need to use a left wing feather and vice versa for right. You will also need to decide which size feather to use. I like the 5" shield cut. The parabolic is quieter. As for the fletcher, Bitzenburger and BPE are both good. The BPE is more adjustible than the Bitz and is a lot less money, but both will do the job very well.