Packard Bell POS P75, Win 95a

I would like to upgrade my CPU.  I cannot afford the Intel Overdrive.  A
catalog, I have, lists three choices from the following manufacturors,
Evergreen Technologies, Zerus Hardware and PNY Techonologies.  They are
all about the same price and up my CPU from 75 to 180MHz.  They also
offer CPUs that would make the 75 a 200MHz for $30.00 more.

Does anyone have any experience with any of these units?  Is it worth
spending $30.00 to go from 180 to 200MHz?

Any advice is greatly appreciated!  Thank you.