Hey Arun01 the surface pro 2 currently costs just $100 more than the surface pro 1. If I were you I'd spring the extra one hundred to get the multi angle kick stand, extended battery life, and small boost in performance. The extra battery life would be the big seller for me because 4 and half hours of battery life on my SP1 puts me in a few tight situations sometimes.
I would also put off getting the Lenovo Yoga 11s since I sense they are going to announce the next Lenovo 11 any moment now. They already announced the next Yoga 13 coming out this October called the Lenovo yoga pro 2. EVEN IF
you didn't want to get the next generation yogas, if you just wait a few months the current ones will drop significantly in
price. Personally I am leaning toward selling my Surface Pro 1 and probably getting the Lenovo Yoga 2 Pro which has a
3200x1800 resolution, 9 hours battery life, back lit keyboard, adjustable screen with multiple modes, 2 usb ports, full SD card slot. Or I'd consider the 11 inch version of this