I've tried a few banks for business accounts;
Bank of Ireland--online service is appalling, bad in lots of ways, costs €10pm. Don't be fooled by new updated version, its been described as lipstick on a pig in other forums.
AIB-- expensive and pretty awkward to use, card reader required just to login so not practical.
Ulster Bank-- in my experience the best of the 3, but I'm only using it for the last 2 months.
I use bankline (the comprehensive platform) and anytime (app and desktop). The app is very handy for tracking incoming payments and uses iphone fingerprint reader to simplify logins.
Hope that helps.