everyone has their own thoughts about doing something like that... I never run my cycles like that... my orals are typically at the beginning, as kick-start to a longer-acting ester.
If you say that you're looking to for lean, vascular gains from this cycle, then your diet and training and AAS use should reflect that THROUGHOUT, not just the last 6 weeks... so then you wouldn't need var at the end to "cut up" See what I mean? If your diet is clean and your bodyfat is at a good rate, the proviron should do nicely for you.