you can alway's look for a LC475/Performa 475/ 476 or Quadra 605 (all are the same systems just renamed.
they are little and once upgraded are great little system's (they are stock). they will handle up to 132mb ram, 1mb vram (stock 512K)( replace the 68LC040 25mhz (has no FPU) cpu with a full 68040 33mhz or 40mhz cpu), no cd rom drive (but there is a external scsi port so you can buy a external scsi drive to use. and plus you can but a PDS ethernet card for it to surf on a fast internet conection (most mac's have this ability)
mine has been upgraded (132mb ram full 68040 40mhz cpu (running at 25mhz) 1.2gb HDD, stock 512K vram and runs OS 7.6 great. will be soon moving the speed to 33mhz or 40mhz once i buy the resistors. and will be upgrading the vram to 1mb. this system will run up to OS 7.1 to 8.1
i love mine
they are little and once upgraded are great little system's (they are stock). they will handle up to 132mb ram, 1mb vram (stock 512K)( replace the 68LC040 25mhz (has no FPU) cpu with a full 68040 33mhz or 40mhz cpu), no cd rom drive (but there is a external scsi port so you can buy a external scsi drive to use. and plus you can but a PDS ethernet card for it to surf on a fast internet conection (most mac's have this ability)
mine has been upgraded (132mb ram full 68040 40mhz cpu (running at 25mhz) 1.2gb HDD, stock 512K vram and runs OS 7.6 great. will be soon moving the speed to 33mhz or 40mhz once i buy the resistors. and will be upgrading the vram to 1mb. this system will run up to OS 7.1 to 8.1

i love mine