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@Max
Would agree with Roberto - one of cycling's best advances in the last 20 years was the cartridge BB. Shimano UN71/72/73's are legendary but a brand new genuine Campag cartridge BB can be bought for little more than £10. I would spend a little more though on a higher spec model (Chorus/Centaur) - or buy a SH one on eBay.
The other thing is to look very closely at your bearing tracks - like headsets they can become overtightened and you end up with tiny depressions in the surface. Known as 'indexing' - makes the bearings all notchy as the balls run in and out of the depression. Throw it away in that case - new balls will not help.