If you have a Pegasus, just use the glass bed. PETG prints fine on hairspray, same as PLA or ABS. PLA/PHA should also print the same. Polycarbonate is a total PIA. You do need something weird to print it on. What depends a lot on who you ask and what their process is. I avoid the stuff.

I'd get the "deluxe upgrade" before I enclosed the printer. I mounted an LED light on mine and redesigned the extruder from scratch to have a cooling fan and an integral BL Touch mount.