Back to the OP:
I dive in the North East (last weekend: double 100s and drysuit in 36F) and got a set of HP100s that I split up first, using plugs for the modular valves. With the single tanks I got used to the new drysuit and then doubled them up again. Unless you are a "Wunderkind" a new drysuit and new doubles all at once is a bit much to master. If the volume is sufficient for your dives, you cannot go wrong with HP100s.
Aluminum 80 doubles are sweet for wet diving, especially in fresh water. They really make you understand and appreciate the concept of a 'DIR balanced rig'. But, by the time you add the lead to sink them in salt water in a drysuit with heavier undergarments you will most likely lug around more weight on the dry than with HP100s that hold 50% more gas. (Caveat: HP100s are about 24lbs negative when full. If you need to add weight, make sure it is ditchable and never dive these puppies and their biggers siblings wet unless you can walk out of your dive site in case of wing failure).
PM me if you need the plugs to split doubles.