Acer Aspire 3680 Processor Compatibility?

Hello, I have an Acer Aspire 3680 and i want to upgrade the processor. I was wondering if someone could give me a list of processors and their prices that are compatible. All help will be greatly appriciated. It currently has a ---- Intel Celeron M processor 440 (1.86 GHz, 533 MHz FSB , 1Mb L2 cache) --- I would like one that is quite more powerful than this. Thanks.