I think 2x would work well for 20h. But it doesn't make sense to use the same spoke count front and rear. The rear is always weaker than the front due to dish, and it gets more stress. There's more weight on the rear, most riders can lift the front for obstacles but not the rear, and worst of all, it gets the pedaling force in addition to holding up the back of the bike.
I'd do 24h rear. And I'd use Race spokes for the DS. That will make the wheel stiffer laterally and it only costs about 12g.
Speaking of weight, those rims are nice but they're not WW. It doesn't make sense to me to start with kind of heavy rims and then go all WW on the build.
If you don't like radial lacing, try 2x both sides on the rear and 1x on the front. I've done a few that way and I like the way it works. It's also a little easier on the front hub flanges if your hub is known to deform under radial lacing (the BHS hubs don't seen to have that problem).
Just to be clear I'm only still tooing and froing on the front
lacing. The rear will be 28h (2x NDS and 1x DS (heads in)). It's good to hear that you think 2x will be ok on the front though. Would 1x be better
, or are we really talking about no gain here? Usually I don't put aesthetics first but that really is my only reason for not going radial.
If I go x1, are there any good links to how to do it? In the past I've only done 3x, 4x, and crowsfeet. This will be my first low spoke count road wheelbuild. I am unsure whether to alternate the heads in/out or have all out like here:http://farm3.static.flickr.com/2626/3729816308_bb5df5cbe5_b.jpg
I take your point on the weight of the rims, but I'm set on wide clincher rims and have a limited budget - which limits the options. I could go for the A23's, H+Son's or Pacenti SL23... but they're Not a huge amount lighter and all shallower. Although the Pacenti isn't much shallower, it is more expensive. So overall I've gone for more width and depth with an eye on price. The BHS hubs seem to be well reported and aren't expensive so there doesn't really seem a reason not to use them. I'd usually never worry about things like hub weight due to it's location relative to the wheel.