Mobile Phones

My current phone is getting on my wick, its a fairly new and shinny samung but and this is imporant its let down in two key areas which seem to be common to most samsung phones the T9 predictive text engine is horrible to use and since I send a fair number of texts this is important to me and the damn thing only rings at an audiable level two seconds before putting people through to the answer phone (maybe this is a feature of polyphonic ring tones but its v.annoying to constantly be too late to take calls).I was wondering if any one has used a sony ericsson phone, are they any good?I would like to go back to nokia but can't find a phone of theirs that suits me at the moment, are their any other brands/phones anyone would recomend?Also I am thinking of switching to O2 as their Pay&Go package looks superior to orange, but I have no idea what O2 is like as a company any info anyone has would be a help.cheers