PCI doesn`t make much sense if you dont have at least an 040, better 060 or PPC. A weak 030 doesn`t take much advantag of the possibel speedgains of PCI over Zorro II in an A1200. Price isn`t that much of a point too: While the PCI cards itself are a lot cheaper then Zorro ones you pay much more for a A1200 Mediator then for an old Micronic ZII, or an ACT Z4.
If you allready have ZII and a GFX card for your A1200 there is absolute no point in "upgrading" to PCI unless you plan to dramatically upgrade your CPU-Power as well.