Dave,
You can use IPA with Tamiya, but having had a problem after breathing the stuff, I would say that if you buy the Tamiya Thinners in a 250 mil bottle it is not too badly priced and I find is the best product being specifically designed by them.
Isopropanol is readily passed through the lungs into the bloodstream and can cause problems aside from getting drunk and thinking that everything is funny.
In the 250 mil container, the Tamiya is quite good value.
John