FYI: TSX is backordered from Dwyer/Love. Estimated ship time is 8 weeks. Un-freaking-believable.
SO I went with the TS2-010 - in hindsight it appears to be a better solution anyway - I guess a probe isn't included in this one so I added a 5' w metal probe. I TXFR'd to technical support and they said this would work fine as a simple on/off switch. The TSS2 (dual stage) would be the one for a fermentation vessel where you want to control on/off on 2 different items (ie freezer compressor & some sort of heating element).
TS: $65 Heating or cooling applications includes 5' probe
TS2: $50 Heating or cooling applications - does not include probe (one can be purchased for $7-$9.5 depending on length)
TSX: $55 Cooling Applications only - tech guy said it was too complex for what it is designed for. I believe this doesn't include a probe either
TSS2: $69 Heating or Cooling Applications - 2 relays - can operate 1 heating and 1 cooling device - good for fermenter
Hopefully that helps someone who had the same questions I did.
Here's the link to temp controllers: Dwyer Instruments - Temperature Table of Contents