Looking for a solid gaming mouse

I know, there are dozens of threads to this extent all over the place, but I have a very specific need. I want my mouse to have at least one or two buttons which can be set as modifier keys. (Another alt, shift, ctrl, etc). I am currently using a razor lachesis. I'd VASTLY prefer the mouse be wired. I am often on my computer for 12 hours straight on some work days and I'd rather not being going through 6 bucks in double a's a week. If it's not wired, it needs to be rechargeable at very least. My biggest priority however is being able to use one of the mouse buttons as a modifier.

Still looking for a mouse, nobody seems to know anything about one.

Razer Deathadder is a solid gaming mouse. Has a great Sensor compared to other mice.

Do any of these allow the creation of a NEW modifier key? Not just the binding of shift onto the side, as is my current one.

Take a look at the Razer Imperator..it's wired and very comfortable for long usage....But they do have quite a few mouse to choose from, so best bet if you can try several before buying. Razer, IMO, best mouse manufacturer.

Used Logitech, Microsoft before and I was not happy after awhile, either the button placement or design discomfort.