TM01 is $4500 for frame, fork, seatpost, stem and brakes. No bars included with that module. But, R&A has builds ranging from $5000 for Ultegra (!) to $6000 for Red to $13000 for Di2 and 808s.

Love the new P5 but that TM01 is pretty sweet too, and on my short list.

Edit: Excel Sports has the Di2 TT upgrade group for <$2300. Odds are you already have race wheels of choice, probably a saddle too. So, $6800 + crankset (and you might already have a PM) + bar of choice = easily under $8000, with Di2 pursuit shifting to boot although you won't have those cool Magura's, which probably can't be retrofit to the TM01. Still, not a terrible option ...