Nice score. How much RAM did it come with?

The 133mhz can be swapped directly into the 117mhz and might be the most cost effective option for an upgrade. There is also a 180mhz 603e or various G3 upgrade options, but those are less common. Having used both a 133mhz, 166mhz, and G3 233mhz, I would just find a 133mhz and save up for 64MB of ram if you don't have that already. It makes the most difference IMO.