From the previous posts I assume you are mainly targeting pike? I switched from steel to heavy flouro on my pike setups a few years ago and have been very happy with the results. Flouro is the only way to go! I have used both side by side and the flouro consistently catches more fish. And an underwater camera proves why!
If exclusively targeting pike with big baits I use 60-80 lb flouro with crimps. I haven't tried a ton of brands (there aren't a lot of brands that make that heavy of flouro) but have had great luck with Hi-Seas. They sell a spool specifically for leader material and I believe it comes in 25 yard spools for around $20. The line can get some coils in it from storage on the tipup spool but I just grab a hold of each end and give it a quick stretch before sending it down the hole for the first time each time out.Knock on wood but I have yet to break off a pike. As a matter of fact, I have lost more pike from steel leaders and quick strike rigs pulling out of factory crimps!
Most of the lakes I fish have walleyes or lake trout right along with those big pike. The flouro allows me a good chance to get bit and then lend all species! If fishing mainly for walleyes with the chance for a good pike, I will use a little lighter flouro (20-30lb) as it will still land the big pike yet be a little more limber allowing more movement from the smaller baits.
