Have you compared cost and upkeep on the two suits, yet? You're new to Scuba, right? How often are you going to dive in cold water, do you really know?
I dived California's Channel Islands last May, down to 10C/50F, and while a lot of the regular divers were in dry suits, it was a once a year trip for me, so I was in a 7 mil semi, 2 mil gloves & beanie, heavy booties, and I was fine, as were other wetsuit divers on board. Wet suits don't have to have seals replaced, punctures repaired.
Dry suits can be great, essential for some women who chill more easily, but - the cost of a 7 mil wet suit is only deposit on a dry suit and insulation garments. If you go with a wet suit, drink warm liquids only, keep your head covered at all times on surface intervals, :loki3: and maybe pour warm water down the inside/back of your suit before going in.