Well this ought to be fun

Hey all, just about ready to delve into the depths of my least favorite subject, wiring. Involved is my 1988 GT which is a Saleen Clone that has been converted to mass air(new computer/harness/etc) I have dash wiring issues, underhood wiring issues, and trunk area wiring issues, I guess you could just say I have issues... Anyway step one is I need a code reader, I know you can do it with a variety of inexpensive tools but I want something that will read obd1 and odb2(wifes car) and display the codes onscreen. I'd love a snap-on but thats way out of budget. Can you guys recommend a decent tool thats not crazy expensive but isn't dreck either?
thanks!
Matt