High performance rear shock suggestion?

[xpacpal1x_imp]

I recently mounted a fork brace and experienced an improvement in handling. As a result, I'm now looking to improve the performance of my rear shocks. I'm a bit surprised that I've modified my bike so much (PCV, Staintune, K&N air filter, Superbrace fork brace), but I've rationalized that I what I really liked was the CB1100 prototype, which looks a bit sportier than our stock bikes, as it seems to have featured better rear shocks (with external reservoir), apparently larger front fork diameter, and maybe even higher performance exhaust. I'm also doing much more canyon riding than straight-line cruising and city driving, so little bits of performance here and there matter to me.

I care about how the overall bike will look, and don't want to depart very far from the silver/chrome/black/red colors that the stock bike has...and that seems to rule out several rear shock alternatives I found discussed on other threads.

Again, I'd prefer a high performance rear shock that looks similar to stock (chrome/silver without external reservoir) or similar to the CB1100 prototype (chrome/silver with external reservoir). I also don't want to mill out a portion of the grab bars, as I believe at least one forum member did to provide clearance for external reservoirs. Is this a lot to ask for? Can anyone provide suggestions?