Server overloaded.. Too big? Or need new script?

I've been running my MineCrap server since August 8th, 2012.

It runs 9 worlds and usually has around 32 people online. Last month, I had to upgrade the server from 6Gigs of RAM to 8Gigs, and now, a month later (now), after a day or being online, it will say that its getting overloaded and then eventually stop accepting logins and not even show up online at all. Constantly restarting the server is getting very much annoying.. what should I do?

The server is currently running on 6014MB, 64bit Windows 7, with the standard bukkit script, running 52 plugins. If I can't find a solution to this problem, I'll have no choice but to buy this $2,000 64Gig RAM server next.. help!

Also, should I use this? LINK

 

CayleRose

What CPU does your server have?

I am guessing it is a Intel XCRAP.

/joke based on the name of your minecraft server and forums.

 

Nathan C
Is there a different script I can use to fix this?
I need my server to not take up as much space and resources...