Best solution for mobile version?

[uniqu3]

I don't see why anything above 968px should be considered Desktop, here is a nice chart http://thedigitaldisciple.net/tablet-sc ... ion-chart/ and i know my nexus 10 is definateily not a Desktop neither is my nexus 7 and also not a phone!

Generally it depends on project, what tools should one use and why, that's something everyone has to figure out on it's own, so is it responsive, fixed, fluid, adaptive, it's up to situation.
Adaptive is nice one can prevent loading of unneeded css, js, images or content, whatever but in my opinion responsive should not be ignored even with adaptive as browser sniffing isn't 100% reliable but a visitor should have a decent experience, besides with windows 8 devices, there is snap view as well.

Regarding responsive navigation that handles desktop and mobile properly, it can be solved in few lines of JS (and a regular non-tech user will NEVER disable JS on mobile device) whereby using mobiledetect plugin JUST because of navigation is plain stupid, consider plugin size, php memory used and time that server needs to run it, sniff browser etc.