Wire is the way to go. Once the fleas come out, and when is anybody's guess this year, braid becomes difficult to use.
Get 1000 feet of wire for each; Malin, Mason & AFW get the majority of the business with Torpedo the newcomer (and less expensive). We're running Torpedo 7 strand and 19 strand wire with no issues but not a lot of hours in yet either. The major brands all make reliable manual riggers (we're using Cannons) but make sure whatever you get will handle the weight you want to use. There's always used manual ones for sale - if you can afford new manuals, you might as well pay for used electrics instead.
One option instead of manual downriggers is to try running Torpedo Divers to get your line down where you want it. The owner and one of his sponsored pros are members here, posting regularly. http://www.torpedodivers.com/
The guy I fish with and I are in a similar position but running one season ahead of you.