I need completely working engine(core of the site, php) with possibility for me to accept payments from credit cards and webmoney, and with possibility to send money both to webmoney, and to banks(?) . And client registration and creating a database of clients, etc. should be obligatory. Will pay. Once again, I need just the core, we will finish the site by ourselves.

Hmm, if you are looking to hire, then perhaps the freelance jobs section is what you are looking for.