The 153 is on sale at my local Frys for $50, so I'd be looking at that one. I've actually already bought it to pick up after work, and I'll try to listen to them before I walk out with them. The larger woofer and the front port, as well as the decent reviews on this site caught my eye, and the discount pushed them over the edge. The only problem might be the size, they are significantly bigger than the S30s, so I have to decide if I'm willing to haul them around.
I'm also ordering both the dayton DTA100a and the APA150 to see if the power of the 150 is worth the size and weight.
I'll have plenty of time to return and reorder if you guys tell me I'm doing it wrong.