There are a number of flaws in your configuration.
First, it does not make sense to buy speakers from different companies. You will lose what is called timbre matching.
Second, it is stupid to mix active speakers with passive one.
Third, if you are going along with active speakers, you do not need an amplifier such as the AVR 2911. Just go for a good surround sound processor, and have active speakers all around.
Though Velodyne is good, there are equally good subs available at better prices from Paradigm, Martin Logan, and Deftech. At around 80K, a sub from SVS/Hsu Research will beat a Velodyne any day.
Are you doing something about room acoustics? If someone is advising you otherwise, please take a a hard relook. With the given room size, you cannot install a HT without acoustics in place.
Cheers