I had a p990i up until about 3months ago. I never really used the keyboard as the keys were too small and I found predictive text faster.
If you want something similar I'd go for a Sony Ericsson p1i. I would consider it the replacement for the p990i. It doesn't have a true qwerty keyboard but it does have a qwerty rocker keyboard. This means you have 2 letters per button and you press them left and right to get the different letters. It takes a little getting used to but it's pretty good after a bit of practice
I have a friend who loves is Sony Ericsson smart phones. He went from a p910i to a p990i and he's now got a p1i. He's very happy with it and uses it like an organiser/diary.