On my last visit to Pattaya (November 2008) I stayed at the Amari Nova Platinum. Nice hotel, reasonable prices - especially pay in advance at time of booking - and an easy walk to Sunee Plaza. The hotel has free wi-fi.
I stayed in a deluxe room which had a pool view and was very quiet. The other rooms over look the road so there might be some traffic noise there.
I plan to stay there again in October when I visit again.
Nova Platinum Hotel, Pattaya - Official Site. Quality Budget Hotel in South Pattaya