I would get just two step polish, and if you are looking for just 'decent' results. Go with a less expensive gloss polish. Or try and get a sample from someone here. 2 oz does a whole car maybe even less really (if you ask me).

So, I would get:

Menzerna SIP & One 6" or 6.5" orange pad.
1z paint polish (18$) with a white pad.
Use your Meg's wax...
Stand back after 10+ hrs of polishing, and have a beer.

IB