SiriusXM metal?

Your best bet, if you've had an account with them in the past, or had a free trial with a new car, is to keep an eye on your email - every so often they'll send out insane promotions, like getting 5 months for $21 (I've gotten that one a few times).

But $17.95 or whatever per month? Meh.
 
The other component that makes Spotify intriguing is the social media aspect of it. You can see what all your FB friends are listening too and even share playlists.

Overall, I just think it's ability to stream and store (you can keep over 3,000 files local for when you're in airplane mode or have degraded service) high quality files, its breadth of catalog, its price point, and it's FB integration, makes it the best option. Plus, unlike Sirius, you can cancel at any time.
 
Plus, unlike Sirius, you can cancel at any time.

Unless something has changed, you always could cancel at any time.

As someone who used both back in the day, and used to argue enough that I eventually got an invite to visit XM headquarters, I can say that satellite radio was always a frustration for me. Over time, the more adventurous channels would go by the wayside, to be replaced by the lowest common denominator stations. Da Boneyard was rarely adventurous, and given the popularity Eddie Trunk had on there, you can see what kind of crowd they attracted. Once Sirius bought XM, that was pretty much the end of the line.

I'm pretty much convinced now that any traditional-styled radio station is going to be boring as hell and you won't discover much from it because the listenership basically just wants to listen to the familiar and has a low tolerance for anything new.

For me, on the occasion that I need to listen to online music service, I'm listening to last.fm, if just because it has a record of my music collection and can base stuff off of that. Problem now is that they seem to be moving to YouTube songs, which are highly uneven as far as content, and the ads are getting ridiculous.
 
I listen to Ozzy's Bone Yard (classic metal, lots of Dio, Maiden, Sabbath, ect.) and sometimes the Hair Metal station. Liquid Metal is mostly garbage with a few good new things thrown in here and there.