Of the two things you say you'll miss in the 335i:
1) low down grunt
These are the most compelling reasons to switch to a 335d and where it excels over the 335i... I'm confused!
Car: 2010 Jaguar XFR (Stock - For now)
Gone but not forgotten: Highly Modified E90 335i LCI M Sport Manual (circa 480BHP/500lb ft)