How tough are limit games?

[pokerrod]

I am getting back to poker after almost one year.I really feel like am lost.Wondering where to start? which limit and which site?
I checked fulltilt and pokerstars and games are really tough.
Most of them are shorthanded .I am looking for both shorthand and ring games. But there are few ring games offered now a days.

Anybody please advise me which site is best for lowlimit games upto 5/10 for both shorthand and full ring.I really want to achieve 1bb/100 without rake back. I did it before 2+ bb (though only 25k hands).
But now games are tough and i need honest opnion from you guys which limits + sites we can beat for 1bb multitabling .
I would really appreciate your help in suggesting something good.

Thanks