Yup, waiting's a good idea - that way you can really relish the Starter Pack and get some feedback from people who've played Lone Ranger.
I've ordered the Lone Ranger playset because Amazon UK are doing a good price on it, but it's the only additional set I've preordered. I'm actually going on holiday to Disney World at the end of September, so I'm not buying any more figures until then (either at Disney World or once I get home) so that I have something to look forward to when I get hit by the post-Disney blues!
That's one of the things I like most about the range of figures. If I'm having a bad day or just feel like treating myself, I can buy a new one to cheer myself up. Hopefully my local supermarkets will stock them (they stock Skylanders and often do decent deals, I hope that's the case with Infinity) so I can even buy myself a sneaky Infinity figure on an otherwise boring trip to get food!