I think the new Cooler Master Storm mice are the best bang for your buck mice on the market. You've got the entry level Xornet (2000dpi) and the higher end Spawn (3500dpi). I've seen both mice go as low as $15AR during a few sales.
They share the same design but the Spawn has a slightly better sensor and one more button is programmable. Build quality wise they're solid, I own the Xornet, and they both use Omron microswitches rated to 5 million clicks. I'm familiar with Omron from the arcade stick scene, Japanese made switches used in high end arcade parts, definitely quality stuff.
They're also pretty well supported by Cooler Master, each mouse has a number of different firmware updates available that tweaks settings such as lift off distance, max perfect control speed, and performance on light or dark mouse pads to better suit different people's needs. Their forums feature a lot of feedback and tests run by the community that critique these mice in ways I never even knew existed before I started looking into buying one.
I think unless you have goliath hands (cause they're a bit smaller than most other mice), for what you get for the money, especially when on sale, these mice are a no brainer. I had 2 Razer mice before buying this one and I definitely won't be going Razer again. The scroll wheel on my Diamondback 3g failed within a few months, their prices and the amount of products they're putting out are going up, while quality is going down.
I've actually seen 3 mice from 3 different companies (not all mine) with scroll wheels that developed the same problem where you try to scroll down and it goes down then back up a bit. Kind of weird.