too few items in todo list of 7210

I am doing a small research before purchasing a nokia phone. One of
the things I am looking for is a todo list. In the price range I am
interested, the candidates are 7210, 6610 and 6100. Their todo list is
only 30 items. Is there a way to increase that, or maybe use a java
application that can extent it, or make a java application from
scratch? I am a programmer, so if it can be done and it is not out
there , I will do it. Also I need syncronization with Lotus Notes
and/or MS outlook. Any other nokia phones with larger todo lists?
My other criteria are:
calendar with alerts
sync via infrared,
address book with groups