You're probably right to dismiss the Pikes if you are after a sub 28 lb build. They're good forks but about 12oz heavier than the standard Float 140's. Manitou's may be an option ...
Even with discounted 08 bits I would imagine getting down to 28lbs is going to be spendy. My 08 VIP 55 has the 454 Pikes, Deus post, bars & stem, SDG Ti saddle. 540 pedals and DT 5.1 wheels. Everything else is XT. It's 31 lbs.
A lighter wheelset (719's on Hope hubs for example) would save 8 or 9 oz but at a cost.
Lighter forks could save 12 - 16 oz.
Good luck with the project. Please let us know what you use and how it turns out

Steve