I'm not one who typically mixes traits. I usually try to keep light rims with light hubs. To me it doesn't make sense to go for a heavier more robust hub like the Alchemy into a set of rims that is designed to be light with no other real goal. You loose the weight advantage of the rim by using a heavier hub and you loose some of the rigidity benefit of the hub by using a rim that isn't stiff enough. For me personally the gains don't make up for the drawbacks. I do understand trying to balance the traits and get a compromise in the wheel but for me personally I like to try to find one direction to take the wheels. Obviously every gain means giving up something else.
I say if you're dead set on 200 rims go with Tune hubs and be light.
If you really want Alchemy hubs get a rim that matches their characteristics better, like the 270.
This is a really good recommendation.
My training wheels are a set of custom-built HED C2 rims, Sapim CX-Ray spokes, and White Industries H2/3 hubs, 28 double-crossed front wheel and 32 triple-crossed rear wheel, for $900.
I have been lusting for a more aero set of wheels.
Although I really like the 23mm width of the HED C2 rims and the aluminum brake track, I can not get myself to pay retail for the HED Jet 6 FR's @$2000 with no discounts in sight!
I have been thinking about getting a set of custom-built wheels: Enve Smart 3.4 (too stiff and harsh? and may not durable enough?) or Zipp 303.
Pairing with Chris King R45, White Industries, or Tune Mig/Mag?