At $799, I'd wait and grab a 5-20 HD for just a few bucks more. Unless there is some reason you don't want the 5-20? Size/weight/etc? The versatility of a zoom is likely to be much more useful long term than a small improvement in IQ without having zoom capability.
If I could get the 10x HD significantly cheaper than the zoom, I do think they're a good option. 10x is a good mag and I'm sure they're extremely clear.