Financially, it is probably better to trade for a FIKI aircraft rather than to do an installation. Used values are bumped by maybe $20k for TKS, and you can buy a discounted avionics upgrade at the same time or at least find a similar setup to what you've built. Or you can convert yours knowing that you won't get back more than half the spend.
I installed non-fiki on my 231 20 years ago, and IIRC, it was something like $17,000. It was worth every penny to me since I commuted in the Northeast in the Mooney. There is a speed penalty of 8-ish knots that I've observed on both the Acclaim and the 231. That speed loss seems less at high altitudes, which makes sense given the lower IAS up high.
TKS is also a leading-edge paint saver. The panels take the hit from rain, so you won't get the bald spots many Mooney's have on the leading edge.