IK you decided but I just felt like posting this anyway. The best budget mice that I can think of are the Roccat KPM (3310), Func MS-2 (3090), Rival 100 (3059), and Zalman ZM-M600R/SkyDigital NMouse 4K (3090)
Prices on the first two can be all over the place. The uglier colored KPMs were being sold at $25 or less on Newegg at times. The MS-2 was being sold on Newegg for closer to $20 and I actually like it more than the KPM, but it seems that they finally went through all their stock of it. The Rival 100 is an okay buy, but it needs to be kept at 500 CPI due to weird bandwidth constraints that will massively lower PCS the higher you set it. The ZM-M600R is quite a good buy actually. Just about as good as the 3090 sensor gets and in a G100s shape. The G100s' AM010 sensor feels better.. until it malfunctions all the time if you're a low sensitivity player. Only major downside is the Zalman has a really high lift off distance and the only person who's gotten around that properly is qsxcv with his teensy mod.
On the real though, I think the KPM and MS-2 are uncomfortable and the ZM-M600R's lift off distance issue is a big deal. The Rival 100 is an okay buy, I personally find it's a little too low and I can't grip it like the G100s shape. The only issues I had with the KPM and MS-2 were the shape as well, but I feel strongly enough about those that I think most people would feel the same. If you like the G100s shape it will probably be worth waiting and buying the "Logitech G Pro Gaming Mouse" since it has an incredible sensor and is well built and has a good warranty, but If money is that much of an object, I would go Rival 100 - unless you're sure you won't hit the malfunction speed of the G100s
Edit: those EVGA mice SmashTV posted are really well priced too.
Edited by dutC4 - 8/22/16 at 7:58pm