By a Shadow and be done. Buy once, cry once. Yes, it's $880.
But I own a G34 which is now non-production class legal, I competed with a 5" M&P Pro w/ Apex kit, and then moved on to an SP-01 (non-shadow). Guess what? I just spent even more money and picked up an accushadow from a member here.
That said, the base model shadow will have a decent trigger, sights, no firing pin block etc. My M&P was a fine performer (with an Apex kit, a Wilson bbl for 147gr. loads, etc) but by the time I was done, I had quite a bit of money wrapped up into it. And when you really want to, you can have it turned into an accushadow, or have trigger work done, etc. The CZ will also have better resale.