First, addressing previous posts.
Warlock is very similar in mechanics (yet VERY different in feel) from a hunter, so it could be a good alternative if you want a hunter... that isnt a hunter.
Monks are very fun, and very quick to level, however they are going through a lot of class changes right now because of being the newest class, so I do NOT recommend them until Blizzard is done changing things. (At least from your comments I assume logging in and hving an ability totally removed would not be good for you.)
Enhancement shamans are fun and beast, however I find them awakward at first because of the tightrope of 'I am melee, but I have very few melee attacks at first, so I must cast and THEN melee' that progressively goes away, but for the very begininng at least, I dont recommend that.
You say you had a druid? Druids are very good multi-purpose classes, and just by themselves have 2 dps options for you (one melee and one caster) they are very efficient at soloing as well. (Also, and just my preference here, a bear tank druid soloing is totally BEAST and you dont have to tank instances just because you are, in fact, a tank.)
Now letsee... New realm, solo character for fast leveling? Honestly, since you seem to like utility (first druid, then hunter, now paladin) I would either suggest you change your paladin to Retribution spec (dps melee) or make a shadow priest. That might sound very off in a different direction, but my shadow priests (yes, multiple) can solo just about anything quite effectively from a nice distance, and heal themselves while they do damage.
Honestly, there is no wrong choice until you DECIDE it is the wrong choice for you. We cant do much other than tell you the pros and cons going in.