[login to view URL] clone with sms notificatios.
Budget is $400, time frame is 2-3 weeks, the winner will get additional jobs related to this project (creating widgets - 250$ each, gadgets for vista and mac...)
Don't bid too high out of the budget, there are a lot of scripts that can be easily adapted for this kind of trading website, only thing you will need to do is code the design (we already have that) and integrate the sms notifications.
You can do this any way you want - using php, asp, any kind of cms, but priority will be given to PHP based solutions.