Follow-up: Well I decided to go with the Infinitys. I did as much listening as I reasonably could in the area. I was able to hear a bunch of Paradigms, polk, infinity, mirage, klipsch and jbl northridge. The Paradigms were very nice, but sounded a little "dark" overall to me, plus they were pricier. The Klipsch synergy speakers had a real nice sound, but the horn tweeter bothered me. I didn't like the phase effects I heard when my head just a couple inches to either side, and they were little pricey for what they were. The JBLs were waay too bright for me, it sounded like someone had messed with the EQ, even when things were running flat.
So after a lot of listening, and deciding what my price range was going to be, the Infinitys came out on top. I felt like they had a little more definition and clarity than the Polk Monitors (which were practically the same price).
I regret not being able to hear any Axiom's (still a bit pricey for me, but it would've been nice), and some BIC bookshelfs, but I decided I didn't want to buy anything I hadn't heard.
Right now I just have 2 primus 150's and the c25 center channel. I'm going to buy my receiver next, and use my old sony speakers as the rear channel before buying either another pair of 150s, 160s or 250s (the primus 360 seems to be a little difficult to find, but it's a possibility).
Which brings up another question - has anybody used ecost.com to purchase a receiver? They have some great deals on factory refurbished Onkyos, but have a little bit of a sketchy reputation. BBBOnline gives them a BBB rating, which is decent.
Anyway, thanks all for the advice, I feel like I did the best I could on my budget and what was available to me.
Let's see how long it takes before I start getting the upgrade itch again...