As far as my usage of mobiles, there has been so many brands and models that I have tried, and was satisfied with my E71 till I bought HTC Desire S. I generally use almost all features on a smart phone-music, email, chat, youtube, social networking websites, etc.
I bought HTC Desire S through FlipKart.com, an online shopping website. Apart from all those nice features that any Android phones have over other phones in the market, what I liked the most is the ability to customize the screens. You can add widgets of anything that you desire on to your screen—whether it is weather, stocks, news, favorite picture slide set, clock, and so on. Another good feature is HTC Desire S is it has got a front camera, that you find only in the high end phone sets; it comes handy when you want to make video calls or when you want to use it as a mirror. Internal memory is 1 GB which gives you freedom to explore Google Play, the app store for Android.
I wish to see a lock widget or save screen backup on the device so that one need not sit and rearrange if at all the device is reset.
I am happy HTC Desire S user.