I wouldn't be so hasty to ditch the PPC upgrade. I run a 601 in my Q700 with System 7.6.1 and it's just fine. A 601 upgraded Quadra can also run PPC only versions of Classic with a little trickery, so you have that to consider if you have enough RAM to run them. The ONLY way to run a modern web browser on a 68k machine is to use MacOS 8.5 or higher and get iCab 3.05 and a 601 in a Quadra CAN run it. A 601 isn't an optimal chip for running 68k code because Apple's emulation routines are slow but if you can get your hands on Speed Doubler it is a big improvement. It also depends on how fast your 601 upgrade is. They generally ranged from 50-100 mhz and the performance varies greatly between models.