best cheapo BB for this is the 105 octalink "5500" one - about £30-35 new, often 10-15 s/h; otherwise ultegra (6500) or dura ace road (7700) both work as long as they are 109 or 109.5 and octalink V1
@M-X started
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best cheapo BB for this is the 105 octalink "5500" one - about £30-35 new, often 10-15 s/h; otherwise ultegra (6500) or dura ace road (7700) both work as long as they are 109 or 109.5 and octalink V1