rodster,
I'm no CB expert either, but I went with a single 3' Firestik Firefly that I plan to mount over the driver window like Phil and a couple others have done.
I haven't fully mounted it yet, but I have grounded it to the H2 and hooked it up to my
Midland 75-822 handheld and it made a big difference in reception without even getting it tuned compared to the reception that the handheld got with just it's little 10in whip. I can pick up truckers on the interstate a few miles away with mild visual obstructions like trees. So it seems for my needs a single stick is plenty.
I'm just too lazy to consider dual sticks and the extra tuning.
BTW, if you are in the market for a handheld/mini, I'm really fond of my Midland 75-822. You can pick it up for ~$85 and it comes with three different power kits, one for completely portable battery powered use, one for in car mount with a 12V plug and antenna connector, and one for AC wall outlet+nicad recharging. It's about the same size as the cobra 75.