I have about a dozen Geissele triggers. And Honestly, I like the SSA and G2S. And from what I learned, Depending on how "tight" the rifle is, will change how the pull feels, I even emailed them about the pull on one of my triggers felt heavier than the rest. And they sent me new springs, and told me the lower's tightness can effect that. As far as the SSA-E and SD-E, i have them and feel they are great target trigger. Feels great in my 308 rifles that will be shot from a rest/bipod. I actually took my SD-E out of one my of SBR's and replaced it with a SSA, b/c the trigger was too light for any stressful shooting.
I suggest you go single stage if you want a FAST trigger, but with any of these 4.5# or less triggers, its easy to shoot quickly.
BTW, about you not wanting to take the 220 dollar plunge twice just to try them out, guess what? When you buy one, you'll end up putting on in EVERY rifle.