Not sure what Pioneer plasma you had but first advice would be to spend some time watching a BV7, particularly with the sources you watch the most . there are many reasons why one would buy B&O - for LCD quality do look at the soon to be released pioneer LCD- not cheap but class leading- if you have decided LCD is what you want.
Well in a way your friend is correct about 1080 full HD. If your watching BR it helps but for an SD source- probably not.
The thing that concerns me the most is that the chassis in the MK11 has very linited connection possibilities and that fact that B&O is slow to adopt newer technology acts against the purchaser in the case of LCD -you cant upgrade it.
Lets not get into the HD audio thing!
Lab 1 by the side- a nice speaker , your choice but they are big! if your in the UK send me a PM-
I suppose it down to price- if its cheap enough easy to justify the cost and upgrade it later!