Well true, if you are pursuing a finance-related career then finance would naturally help
(and if you are bad at finance then I guess thats a hint that it shouldnt be a career)
I'm suffering to an extent in the big4 atm because I have very little financial knowledge (haven't taken my first fin course yet..) ... then again I am working for financial services...
In terms of getting a job though.. even if finance related.. I suspect an employer would rather a D grad in acct than a P or C grad in acct/fin .. After all, you could always study for a CFA later?
Some grad accountants start their CFA straight after uni because they have to have experience before they can start their CA, whereas the CFA is very flexible and you can discontinue and recontinue your progress in the course quite easily.