i found another one for you. its very ergonomic, you can use your whole body to move it...
again, joking aside...
the razer has 6400dpi the other has 3600. technically this allows for more precise movement however turning it way up will also increase mouse speed (unless you adjust it down) and can actually make the mouse on screen more jittery since your hands tremble slightly even when relaxed. i typically only use a resolution between 800 and 2000 and that was sufficient for even the fastest paced game scenario i could think of.
namely unreal tournament on godlike difficulty with 30 bots in a small arena and game speed +50%. it worked fine. the same settings also worked fine for sniping, windows tasks and other games.
the razer does have more buttons and i would highly suggest having the extra buttons like the razer. two extra on the side is sufficient in most cases unless you play mmo games.
keep in mind what i said about the razer synapse software drivers. my brother uses it and he seems fine with it but personally i find it pretty bad. it pops up all the time and needs to sync to the cloud to get your device settings (yeah why the hell would you need that?) and it requires that you register personal data with it (an email address i think) for a razer account. you could always use it without the drivers though (you lose adjustable dpi and ability to change the glowing logo) but other than that it will act fine.
other mice you may want to consider are the gaming mice by logitech (prefixed with G) and the corsair gaming mice. i've heard good things about the logitech mice and the corsair mice. i think both are a bit smaller than the deathadder.
also dont waste money on a hard mousepad. they are expensive and a waste of money for no performance gain. in fact they eat away at the teflon feet on your mouse pretty fast. go with a standard cloth mouspad preferably black.
this is what i use for a mousepad...
....
i found you a hell of a deal....
$40 for an open box for the old style razer deathadder (not the new 2013 version) which they still have regular drivers for (instead of needing synapse 2.0). this is what i personally use...
http://www.newegg.com/Product/Product.aspx?Item=N82E16826153058R&nm_mc=KNC-GoogleAdwords&cm_mmc=KNC-GoogleAdwords-_-pla-_-Mice-_-N82E16826153058R&gclid=CIzW1tDwsrcCFYqk4Aod_VAAMA