My commuting hybrid came with an 8-speed Alivio rear derailleur and a non-series Shimano front mech. Done 1300 miles since January. The RD has been performing okay bar the odd barrel adjustment. Front mech also okay (ish). Never been truly happy with speed and smoothness of either - especially uphill. I clean, lube and fine tune everything weekly. But, Winter's taken its toll and need a new chain and a couple of new gear cables. Visiting LBS next few days. Front mech is particularly rusty - must be steel rather than alloy. Am thinking of using this opportunity to upgrade both derailleurs. Want reasonable performance and durability without spending silly money. I do 120 comuting miles with the odd weekend ride. All roads. Will a Deore front & rear be good enough or will I need to go up to SLX / XT. Don't do any off roading / racing. Currently have 8 speed shifters so recognise these will also need to be changed. Any advice?