Why would you stick with the same manufacturer? There are no prizes for loyalty.
Just go with whatever does what you want.
I had a lot of Sony Ericssons for the simple reason they did what a wanted, how I wanted. I got bored so I got a Nokia, loved it, got a Sony Ericsson again but didn't like it at all really becasue it used the same OS of the Nokia (Symbian....eeewww) which I was bored of so I went Android.
Samsung Galaxy S (it also rendered my ipod touch useless so I sold it).