My first pin was TFTC, got bored very quickly. Both TS and TSPP are light years ahead of TFTC. I love my TS and can't seem to get enough of it. I have had some time (60 plus games) on a local TSPP and really can't get into it. Ruleset is amazing and crazy deep, but personally the layout kills it for me. No flow and crowded.
$4200 for TS is robbery, don't buy it for that price. You should be able to find one around the 3k mark for a nice one.
The best advice I ever got was to play them before you buy. See if any local Pinsiders have them and would be willing to let you come play.
GLWTS!