Good: OP275GP (Analog Devices) Better: OP797AN (Analog Devices) Best: OP627P (TI/Burr-Brown) Best bang-for-the-buck: TL072ACP (TI) Best coice for cheap: NJR4580D (JRC) World's cheapest: NJR4558D (under 10 cents in 5,000 pieces) Paul S.