I fitted a 9 speed freewheel to keep the same as my cassette. I'll check them outd8veh's pic shows the m765 XT's. There's a used pair of them on ebay at the mo in Greece, they are a buy it now sale for £40 delivered. They are for 3 x 9 spd cassette but if you have only 8 spd you should be able to get them to work ok using the stop screws.
why do you want to change your levers?Damn, this conversion is getting expensive.
Not worried about the sensors, it's fitting everything on the bars. Consolidating levers and shift seems like a good idea in the future.why do you want to change your levers?
if it's just to fit the brake sensors, it would be much cheaper to make your own sensors.