What kind of "nice speakers" would TH900 money get you, I wonder? Assuming it's around the $1500 mark, I'm assuming bookshelf speakers or near-field monitors? I doubt you can get anywhere close to the TH900's low frequency articulation at that price range with those, unless you can include a sub in that budget.
Don't get me wrong, I'm a big fan of speakers, particularly active near fielders (used to have Event Opals before I moved to my current residence) but I think the TH900 would be a better choice at that price range. If you had 10 times that money to spare, then yeah, go get yourself a pair of ATCs or Barefoots (plus room treatment) and knock yourself out!!