Going from Stratus Silver to Stratus Gold will mostly make a difference in bass extension and ability to fill the space. If you put them where you have the Silvers, they'll pretty much image the same way. With this big a listening area, you need the speakers out more like 4' out from the wall behind them. And the Stratus Gold's extra bass extension will make proximity to walls more likely for the bass to overwhelm the tonal balance.
Is your Pioneer Elite a rear projection TV? Nothing kills a stereo image quite like filling the area between the speakers with a big flat surface.
Instead of getting Stratus Golds, maybe you should spend the money on a plasma or LCD display (I've even seen 65" 1080p LCD for as low as $2500) and hang it on the wall behind and between the speakers.
Is your Pioneer Elite a rear projection TV? Nothing kills a stereo image quite like filling the area between the speakers with a big flat surface.
Instead of getting Stratus Golds, maybe you should spend the money on a plasma or LCD display (I've even seen 65" 1080p LCD for as low as $2500) and hang it on the wall behind and between the speakers.