Hahaha, whelp, I'm guessing this is yet another one of those cases where what the OP really wanted was just a "thumbs up" - "go with the plan you already had in mind" type of situation. Pretty sure he just wants to buy those Polk bookshelf speakers on ebay. It's rare to have such a specific plan and actually be looking for genuine advice.
So look, YoMoma777, if that's what you really want to do - buy some Polk bookshelf speakers off of ebay - then go ahead. I'll give you "permission"
You wouldn't have arrived at that idea if you hadn't already done some research of your own and decided for yourself that you think that's the best way forward. So chances are, you're not going to be happy accepting anyone else's advice and you're always going to second guess anyone else's suggestion and go back to your original plan that you came up with on your own. That's cool. You'll be fine. The Polks aren't what many of us here would choose, but they're fine. They're certainly not the worst speakers in the world or terrible speakers or anything. Why you'd want to buy them on ebay is a mystery to me. But that's what you want to do, so go ahead and do it. There's no way you came up with that idea totally by accident, so "thumbs up"! Go for it.
If you're genuinely interested in the opinions of others, I'm in agreement with the two main recommendations here, which are the Infinity Primus P163 bookshelf speakers, or the Pioneer towers. Superb value. They do a heck of a lot "right" given the very low price point. That's the sort of sound I wish more folks would start with as they are good enough that anyone can learn how to listen critically and learn to appreciate accurate sound reproduction for a very low cost of entry. That said, apparently you just want these for a bathroom setup and to listen to while you're in the shower. So great sound reproduction isn't exactly super important. There's no critical listening happening while there's water running - lol
I'll say this though, high humidity and electronics don't typically mix. If the plan is to actually have the speakers in the bathroom and be taking showers while you listen, I'd be much more inclined to look at some "outdoor" speakers. That could be tough with your current budget though. Most of the reasonably good outdoor speakers start at about double your $150/pair budget. Still, if the speakers are going to be living in a high humidity environment, it'd be worth looking into
