I have decided to buy a gaming mouse for fps games. I was gonna buy a 1000bucks mouse but today only got an order for a mid range PC from friend. MX518 or G5. Both from Logitech, Microsoft has no mouse to fight these two. MS laser mouse 600 is not so good. The info here is collected from various sites, so can't mention the exact source. The prices are from mumbai, on-phone prices, actual will differ. Do view flash demo on the respective webpages. MX518 The mouse at its best, as many users describe. got gr8 looks and gr8 features. http://www.logitech.com/index.cfm/products/details/US/EN,CRID=2142,CONTENTID=10121 review : http://www.extremetech.com/article2/0,1558,1776396,00.asp it uses optical technology with 1600dpi. it has more buttons than g5 it has no indicator for currently selected dpi level. It can be used on PS2 port too. cost around 2500 in mumbai G5 the latest and best from logitech. http://www.logitech.com/index.cfm/products/details/US/EN,CRID=2464,CONTENTID=10715 review : http://www.extremetech.com/article2/0,1558,1846966,00.asp g5 has less buttons g5 uses laser technology with 2000dpi g5 has 3 led indicators for dpi level (important and very helpful) g5 can be configured, x axis and y axis independently. g5 has tilt enabled wheel. The side click can be used as customisable button in games. g5 has adjustable weight cartridge g5 needs USB only ( i don't remember but on one forum a guy said that it can kill usb port. is it true?) it costs around 4300 in mumbai common points both are wired, i want wired on only. both mice have high dpi and it can be changed on the fly i.e.whithin the game and w/o drivers. gr8 for linux users. both mice have sleep mode disabled. both have 3 yr warranty. my questions: 1)will that laser technology make difference in FPS games? 2)does additional 400dpi of G5 cause performance boost as 1600dpi of MX518 is already very high? 3)on one review the guy said that the ability to configer X and Y axes individually is gr8 for fps games. Is it true? 4)being very weak in bargaining, can u guys plz get me the lowest prices in Mumbai with shop name plz? 5)will any of this mouse last for 5 years atleast (lot of money, u know)? i'll keep adding information as i find. so guys plz help me to choose.