Originally Posted by Burnette

For custom carbon, the Crumpton SL is sweet, frame is five thousand, three hundred dollars. Goes up with options like hidden cables.
For rack bikes, I too like the Cervelo R5, but their site has the frame for $5,000 but also list a complete R5 with SRAM Red build for $5,900. The Cervelo R3 frame on their site is $2,200, $3,800 for the R3 Team Ultegra model. Both are above your price range, but interesting for comparison sake of complete bike price versus just the frame price. I guess there may be deals for these cheaper than their site price, don't know myself.
Cannondale has a super light frame for the Supersix models and an even lighter one for the Supersix Hi MOD road bikes. Cannondale Supersix 3 Ultegra costs $3,350, Supersix Evo Red (lighter frame) is $4,450. Supersix Evo Ultegra Di2 is $5,200. Cheapest Hi MOD bike is the Supersix Evo Hi MOD Dura Ace for $7,990. I don't know much about Cannondale bikes, but my LBS carries them. From what I see on their web site, on some models, they use their own Cannondale brand of stem, seat post and cranks. Whether they are good/bad/eqaul to others I cannot say. There are many Cannondale enthusiast on this board, maybe some of them can chime in here and give you solid answers where I don't have any. First question is, can you buy an Evo or Hi MOD frame? Don't see one listed on Cannondale's site. I have seen some on Ebay, but I would personally rather go through my local dealer if I went that route. If anyone knows were you can buy a 2013 Evo or Hi MOD frame, I would want to know too.
The higher end Supersix Evo Hi MOD bikes are costly and imho have ugly color schemes. The Evo Ultegra, Evo Red and Supersix 3 Ultegra can be had with a decent blacked out frame.