Well, if you love playing a hunter, just make one again! If your goal is to raid once you get to level 70, there are always guilds who, even to this day, are just starting to get into Kara. Also, people know Kara so well these days that it's PuG'ed all the time.
As for finding well-established guilds on your server... it might be hard. All the guilds that I've raided in, I came by on luck. My first raiding guild was still only on Kara when I joined, and started to rapidly progress into gruul/mag and on to TK/SSC. I got unlucky in that guild, because I was their top hunter, but they didn't have any room for rogues, and my boyfriend is a rogue. I don't raid without him. I was pretty quickly replaced.
I got incredibly lucky with my current guild, since it's a mix of people who got fed up with another one, and started their own raiding guild. I was invited the night they formed, and so was my boyfriend. We jumped right back into T5-content, and I've been happily raiding with them for over a month now :)
So it's not impossible to find a guild. Hell, especially since it doesn't sound like you have a buddy that you just won't raid without.