I have some pretty no-name hubs on my 10 year old Giant that has held up my 300+ pounds for 10+ years, and 4,000+ miles... I wouldn't worry about the hubs, and on the same bike I have a no-name Shimano FD that has needed to be adjusted once, but otherwise has been flawless.

My guess is that the lower end hubs will probably weigh more than the more expensive hubs, but should serve you well. A front derailleur shoves the chain back and forth... I would suspect shifting would be impacted more by the teeth, ramps and pins on the chain rings than the FD.