Get the WM Mobile with eyes closed if u want extensive 3rd party software support..the UIQ is the least favored of the symbian os' as far as 3rd party softwares are concerned..
u cud easily get the O2 XDA Atom or Atom Exec for the price of the P1...
And if u do not mind the airtel bundle, get the HTC Touch..its around 18-19k...