You say new Primaris Techmarine, I say... why not paint this classic metal Techmarine instead. This classic Jes Goodwin sculpt was released in a Company Command Squad box set just one month before Warhammer 40.000 3rd Edition arrived. I always liked this model and, as I don't have a Techmarine in my classic Ultramarines collection yet (only the "crew" Techmarine that operated the Thunderfire Cannon), I picked it up to paint when it showed up on ebay. The sculpt is a bit rough, especially the servo-arm backpack that comes straight from the 2nd Edition era Techmarine models, but so far I'm enjoying the painting a lot.
What do you think? And did you manage to grab a copy of Indomitus before it was sold out?