My suggestion would be to get a full set, as it'll ultimately be cheaper than buying them one by one. However, if I was to suggest only a couple of weights, I'd probably suggest getting a 10 ft fast sink rate (16 grain) and a 10ft super extra fast sink rate (40). Sink Tips, measured from T-1 to like T-16 (maybe even higher), are good too, but slightly different (polyleaders are tapered, sink tips are "level").
Plus as always, three of TPFR's board members: Art Noglak at Orvis Arlington, Ryan Mccarron at Orvis Tysons and Richie Farino at District Angling should be able to help too.
Tight Lines,
Andrew R