Personally, I have found concerns of ghosting to be a bit overstated. YMMV, of course. And on the fairly rare occassion I do notice a ghost, they tend to disappear after a few bowls of something more neutral. I think you'll discover the right path for yourself as you add pipes to your rotation and get a sense for what tobaccos smoke best in what pipes, etc.
As for non-aromatics to try:
English/Latakia blends:
GL Pease Maltese Falcon
Balkan Supreme
Virginia-based:
Orlik Golden Sliced
Stokkebye Luxury Flakes
Burley-based:
Amphora Burley
MacBaren HH Burley Flake
Virginia-Kentucky:
MacBaren Old Dark Fired/Ready Rubbed
GL Pease Jackknife Plug/Ready Rubbed
There are tons of great ones to try, but I tried to include examples that represent their genre, are widely available, and include a bulk option