I agree with 2003z.
Back in high school no a/c, smelly exhaust fumes etc was fine. Today a/c modern conviences such as PW/PDL/PS on and on are mandatory for me. On occasion I have to take one of the boys to the store with me or to the doc, no way that would fly in the Z, ever!
My daily driver is an 03 Infiniti G35 sedan with 6speed. Sure used it cost close to $20K but I can hop in it and go to the store or drive cross country with out any issues.
I have two Z's not near your 6 but still $$ to build and maintain. I think the "trick" is for a daily driver to keep you interested in a stock or near stock form. The Infiniti has 260hp/tq and the 6speed. Now I'm not going to tear a vette stoplight to stop light but it does keep the pesky Hondas away, and you can run off and leave those big tank SUV's with scoccer mom behind the wheel, talking on the cell phone, who is having a touch of road rage during "that week of the month".
But seriously you have to take one approach to the Z car and stick with it. Either use it as a daily driver and build it as such or use it as a hobby and tinker with it here and there. Mine is a hobby. If you choose to daily drive it get all the parts together, max out your credit card if you must, and make the payments to the plastic instead of the dealership. Your choice. Either way you'll have your daily driver car in no time, after all it's just money, right?