Let me introduce you to Windows Phone 7
Windows Phone 7 Is a mobile operating system made by Microsoft. Rumored to have started in 2004 going by another name, That was canceled but in 2010 Microsoft resumed development, it was launched in late 2010
With some good, solid minimum requirements. Your phone shouldn't be sluggish and unresponsive. Unless you are running lugs of crap on it.
There aren't too many apps out, But the ones that exist are typically well made.
Now here are some of the best selling hardware, And my favorites:
Nokia Lumia 800
Built pretty darn well, Has the same processor and amount of ram as the HTC titan. And it just looks snazzy
A big 4.7 inch screen with a 480x800 display, With a reasonably thin 9.9mm body, Packed with a single core 1.5 GHZ qualcomm processor and 512 MB of ram. I can't decide whether to like it or hate it. I probably would need to get my hands on one and see if I like the feel of it.
A minimalistic approach, It looks nice.
However it is a bit underpowered, and only 8GB max of storage.
Regardless though, it is one of the cheaper WP7 phones.
Here are some links you may enjoy
XDA developers WP7 forum
WP8, Posted by the god of the windows forum, Panda X