The research nolvadex. Works great. Tastes like ass. If you can find a cheap source for pills you might thank yourself, but I am really liking the IBE nolva.
I am not sure I like the idea of running deca for just 8 weeks even if it did manage to cause less shutdown. Maybe go ahead and run it 10+ weeks and time the start of pct appropriately so all esters are clearing your system at the same rate. I might feel more comfortable with a higher dose of deca run longer with the inclusion of hcg therapy during cycle rather than doing deca without it. Just something to think about. HCG is pretty cheap.
How about running EQ rather than Deca for joint help? Then maybe there wouldn't be the concern over how long to run it.
Given the choice b/w 20mg dbol and 30mg/ED I would definitely select the 30mg.