I'm a bit late to the party here but I'm running 2010 manitou minute 29er 120mm on my chumba HX2. According to manitou they're identical to the tower pro internally. I also had to go straight for the x-firm ride kit/spring and it was a PITA getting one at first. I contacted manitou USA directly and they gave me the part number and told me they had plenty in stock but I had to go through hotlines. Hotlines kept me waiting 3 months! I found a stiffer compatible spring from a local supplier to start with and then after 2 months complained to manitou USA they agreed to supply me one directly, that took less than a week to arrive and cost $12USD plus $10USD shipping. I bought a firm and an x-firm just in case and both springs including postage almost cost less than what one retails for here. After checkng recently I think most of the ride kit options are now in stock in the UK.
Anyway, moaning aside...the x-firm spring really transforms this fork for the hefty rider (I'm about 250lbs.... of pure muscle 
). They are super plush...I run mine at about 90psi and at around 3-4 clicks on the absolute+ damper. Changing the spring is quite simple, if you're careful you can do it without losing any oil and the red grease that the stock spring is smeared with can be wiped off and transferred to the new one if you keep everything clean. I did mine on the kitchen counter (the wife was very impressed). If you remove the lowers with the forks laying horizontal and put some tape over the holes on the bottom you can stand them upright once they've been removed and not lose any of the bath oil.
I was also looking at the TST2s but after extensive reading up on the 2010 models the manitous seemed like a better option for me. The 2010 TST2 seemed to be more suntour than marzocchi from what I read. The 2011s might be better though.
big_scot, do you still have your HX2? I was hoping to buy ton's el cap but a recent house purchase has left me flat broke...
