Looking to not spend over mid $300

Need:
New Motherboard (sub-$100) -
New Processor (Core 2 Duo) -
New Memory -

Need the best for gaming in these categories but not too expensive as I said.. only looking to dual-box max with them so don't need anything super super =P
If you could provide the link to a site such as newegg if suggesting something, would be great.

Thanks!