Hi. I would stay with the same brand, Behringer. The UB series are very quiet mixers, nearly as good as the Mackies and at a small fraction of the cost. The ratio quality/price is unbeatable. You may choose the model according to the number of channels you need, they all use the same channel strips (UB502, UB802, UB1002, etc...). Behringer also produces mixers with basic effects for 'a couple of bucks' more. Alesis has also small mixers of similar quality and in the same price range (some with effects built-in as well).

-- José.