Do you really find it too high, Dave? I have a 65" Mits with a VP150 on top that sounds awesome. It is also a extra 1" higher than the top of the TV because I made a "bridge" out of a 1x6" to keep the weight off of it. I also do not have the VP-150 angled down. It points straight ahead. I tried it angled down a few times, but it just made it sound wierd.
Peter - mine is
exactly centered between the M60s, which are symmetrically placed in the room. I moved the Mits & audio gear into the empty room, set it all up, and then worked around it all with the furniture. So what if there's only a 1 foot gap between the sofa & loveseat to walk through when you come in my front door?
WAF be damned!
Seabear,
If you have Avia and an SPL meter, try this test to locate your center properly. If you get stuck, PM me, and I'll hunt down the link to the real article for you.
1- Set meter to fast response, 70dB range. In Avia "main speaker setup" choose "left-right phase test" (you may want to set repeat to "on" until you get used to it). Adjust volume as needed to get a straight up 70dB reading.
2 - Sit in between speakers at your normal listening distance, and slowly move the meter left & right in front of you. As the "in phase" part of the test runs, you will get a reading on the meter. When the out of phase part runs, you will get close to the same reading. As you move the meter, you will find a spot where when the "out of phase" portion of the test runs, the meter will deflect backwards. The needle really pulls back quickly, too. This is because the out of phase signals from the main speakers cancel each other out at this "sweet spot". Mark this spot. I use a piece of Scotch tape on the couch. If you do not sit on the center line of the main speakers, this point may not be at your seat. I strongly suggest getting a seat at that spot, if you can - you'll love it.
3 - Repeat the same process with the "left-center" test. The backward needle deflection is not as strong with this test (-1.5dB vs. -3.5dB in my setup) than the other test, but you should be able to find the "center" point. The idea is to get the 2 center points to line up with each other. If the L/C test point is to the left of the L/R test point, then the center is too close to you, or needs more delay in the reciever. If the L/C test center point is to the right of the other center point, the center is too far away from you, or has too much delay.
DISCLAIMER: Guy Kuo, the author of Avia came up with this test, not me. I just plagerized it here. 
