The 2004 KHS Solo One Singlespeed is one sale for $400 at JensonUSA. Medium is the only size they still have in stock:

Top Tube Length (Actual) - 22.3″
Head Tube Angle - 71°
Seat Tube Angle - 73°
Chainstay Length - 16.7″
Standover Height - 30.4″

And great specs:

Fork: Chromoly
Brake Levers: Avid Speed Dial 5.0
Brakes: Avid 3.0
Freewheel: Shimano® SF-MX30, 16T
Chain: KMC Z51
Crankset: Truvativ FireX, 33T
Bottom Bracket: Truvativ Giga Team SL
Headset: WTB Threadless
Saddle: WTB Pure-V Comp
Seatpost: Alloy, micro-adjust
Handlebar: Truvativ Alloy rise
Stem: Truvativ XC XR
Tires: Kenda Karma, kevlar bead
Pedals: Alloy VP 566
Wheelset: Formula hubs laced to Sun CR-18 rims