Billy,
You don't need $160 for a decent pair of backpacking boots. I buy all my boots from here:
http://www.sierratradingpost.com/s/asolo-tps/ They always have some coupon for you to take an extra 20%-35% off. Throw in some Sno-Seal and you should be fine for anything in early October. I was up there last November and forgot my gaiters in the car. It was not fun literally hearing the water sloshing around inside your boot.
The light dusting of snow SHOULD (emphasis on the should) not hinder your summit attempt. I doubt you'll be postholing in early October. You might need some Microspikes for traction on compressed snow/ice, but as a dayhike, the most important thing would be for you to have the proper (and extra) clothing as the wet, sweaty clothes and glove may freeze, be very uncomfortable.
Becareful, but don't sell yourself short.
