To cut a long story short, I have a full suspension mountain bike. Its rear derailleur mech (see title) is broken, had a trip round the spokes and age has degraded the main springs. I therefore need to replace it. Now, its old, and you can get the model, but its new, old stock so I want to upgrade the rear mech, not just replace.
So I need a Shimano rear mech, for 7 speed rear wheel, that bolts directly to hanger that is part of frame (Direct Attach). Can someone suggest how to select a replacement mech? I am happy with the rest of the system, which is Dual SIS, and grip shift.
Thanks in advance,