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@Howard
Unless you've got a CK or other exotic and expensive BB it's probably better to replace the cups.
But if you want to experiment with high quality off the shelf bearings buy a basic external BB then pop the bearings out - it's surprisingly easy - then put the new ones in with a suitable press. Just be careful not to crack the black dust seals - they are pretty brittle.
Compatibility: IIRC some basic FSA Mega Exo chainsets will work with Hollotech ii BBs, but SLK-Light / Force do not. <-- read this on the internet somewhere when trying to figure out what BBs would work with an old FSA Team Issue crankset, so you probably would need to confirm it before committing.
Truvative / SRAM have their own system that requires a specific BB.