i don't know if i am really answering your questions but there are a few considerations:
1.
i recently put my Bv4-50 into storage as i moving into a flat for a couple of years. i am now watching TV on a 22 inch CRT and am really struggling with the small screen. it has significantly reduced my viewing pleasure but i will manage. i would urge you to watch both TVs side by side in a shop and see which one you could live with in terms of screen size.
2.
i think the Bv7-32 has an inbuilt beosystem 3 so the picture should be far superior to the bv6-26. again i would urge you to go into a shop and view the current bv7 against a bv6.