Clinet Management Software Recommendations?
 

I'm looking for something that would allow clients to login and see their current status, invoices, what they've ordered, let them edit their contact details, upgrade, order new products/services and things along those lines. Does anyone have any recommendations or no of any with or without a built in support system?

I came across this http://www.dreamcost.com/ it looks pretty nice. It doesn't look like it supports 2checkout though? Anyone else ever used it?