I have a need for a dedicated server for my blogs...

There are a total of 11 blogs and 1 forum.

All in all they get around 20,000 uniques per day.

Right now they are all over the place in different hosting accounts and I am spending $60 per month in total, so I am thinking of moving to a server.

What processor, and memory would I need for the new server- is a high-end celeron good enough, or a P4? I have no clue how to estimate how fast a processor or how much memory I will need.

Any advice from expert webmasters/admins is very welcome :)