I was wondering if you guys had any thoughts about mobile variants on a responsive site. I have been playing around trying to develop alternative screen sizes for tablets and mobile phones.
Up to now, the three variants I have are:

Main desktop - 1100px (for use with flash)
Tablet - (portrait) 580px (landscape 960px) (for use with either wowslider or visual light box)
Mobile - 580px

The problem that I have is that I do not have any hosting packages to test on-line so I have to copy the site to the SD card on my tablet
The tablet in question is a Hudle 2 with a pretty decent screen 8.3 inch (1920 * 1080 pixels 273ppi) and the dimensions above fit the screen like a glove.
I have not be able to test on a mobile phone or a larger screen tablet like an Ipad yet and I was wondering what other people were using to cover all the bases regarding the various screen sizes.
If the sizes above are reduced much more then the main desktop variant comes into play in landscape mode on my tablet....and as you know flash is not supported on IOS or android and will not work.

Any comments will be much appreciated.