Greetings!

I have had a second account and played a warrior tank and disc priest all through Wotlk and quested to 85 together with them. I enjoy dual boxing, but with my lesser playtime, and increased complexity of both the classes and encounters; I barely play the two accounts together anymore aside from dailies.

I would like to justify keeping my second account by leveling up two DPS classes. Two ranged DPS classes should be much easier to play in groups and raids compared to a tank and a healer lol. I would like some suggestions on potential combos that have some decent synergy or would be fun to play together. Two of the same class is alright as well! I am looking for a combo using the following classes: warlock, mage, druid or shaman.

I will likely not bother playing alternate specs, so the ability to tank or heal is of no concern. The majority of my playtime is already invested in a warrior tank and healing priest which I find have enough complexity now to be fun on their own in those roles.

My initial thought was 2 locks or 2 mages for the ease of setup and rotations, but honestly I don't know much about any of these 4 classes. I also thought that the locks and mages might be fun with the ability to have pets.

Anyway, any suggestions are welcome, thanks!

(Small influence may be the ability to play one of the pair decently in a heroic group setting while playing one of my mains, likely the tank. Are any of these classes fairly simple as a slave that can do significant DPS?)