Clinet Management Software Recommendations?

[deadserious]

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?

 

[deadserious]

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?