you are quite right philly - i had that problem recently. As woogie said i found one ebay shop that would ship me some SDS-1's.
I won't ask who, because I finally have my Strat pickup covers (got them today from Thomann, after a 2-month wait - although they weren't expecting them until February :D ). And I'm not after any other DiMarzios now.
Hmmm. Now what can those SDS-1's be for....?

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Since I've hijacked this thread, I'll
try to add something useful in response the the original question, although high-output pickups aren't really my cup of tea.
The Nailbomb usually gets mentioned as the ideal replacement for stock IBZ/DiMarzio pickups, but if you're looking for an EMG-beater it's Miracle Man or Warpig, I think - Ceramic Warpig for extra brutality, standard Warpig for a bit more alnico warmth. The WP might be a great alternative to an EMG85, but don't take my word for it...
As to whether it's worth the extra cost, hopefully some of the guys who've replaced EMGs with BKPs will chip in. I'm certainly happy with the BKPs I've bought to replace various Duncans, Gibsons and DiMarzios.