I'd get something a tad more modern. All of the original box macs with the built-in CRT were pretty awful. You needed a special tool to open them and since most of them lacked active cooling, the CRT, the circuitry driving it and the power supply tended to overheat and catch fire or worse.
I've had many different box macs over a period of time and the only one worth a spit was the Macintosh SE/30 FDHD. I was really lucky with it because it had a NuBUS upgrade card with a 25 MHz 68030 (the onboard CPU was a '030 16 MHz) and 8 MB of additional RAM on the card, plus a color video controller (gave a DB-15 VGA for the back on an external monitor.)
In any case, I'd recommend something a bit newer like something in the Macintosh II family or LC family (the LC III and III+ were the best, the I and II had problems like a weaker 68020 and only 10 MB RAM max.) Some of the AIW LCs (520, etc.) were pretty good also.
Edited:
The Lisa was an awful machine, be glad you didn't pick it up. Of the more terrible things to nitpick about it was the CRT had non-square pixels and a funky resolution to match, making it vastly incompatible with almost all software not specifically written for it. Also equally weak was the MC68000 CPU at 5 MHz (the much smaller box macs had an 8 MHz 68000 or 16 MHz 68030.)
oh I know it was terrible. I know a bit about the history of the PC. Just seems like something interesting because it was terrible, like those pennies or stamps with errors on them.