A second-hand Shimano Supermatch. I have 2; they're as smooth as silk. have a great clutch and are pretty much bomb-proof. Mine haven't been serviced, oiled or otherwise pampered in the slightest and still run like a swiss watch after years of abuse.
As an added bonus they come with 3 shallow match spools as standard which are very often still with the reel when advertised.
Expect to pay around £40 for a good 'un; a bit more for a minter.