I dont think weight is such an issue with diesels as they pull pretty much consistantly even with a load. Yours wont exactly be "slow" either though, could probably see off a few supposedly "quicker" cars.
Standard is in the region of 150bhp and most seem to be consistant woth this, but I havent actually checked mine yet.
My box does seem to throw the trip computer out quite a bit though, says 55mpg when actually I'm only getting around 40-45mpg.