Tigers....OEBT, BTOE or Super all look good with orange/yellow shrimps and won't crossbreed.
Kept them all at one time or another myself.
Harlequins although extremely pretty are THE hardest of all Sulawesi to find/keep.
Best to start off with something that is readily available both on these forums and aquabid.com. When you have kept the least expensive ones alive and maybe bred them too, then you can always go up to the real expensive ones.