Hi there,

on all top end arrangers you will find styles to cover every category, each have their strengths and weaknesses so really its up to you to choose and beleive me you have a lot to choose from...

u have mentioned Roland, Korg, ketron and yamaha. in my honest opnion if u are particularly lookng for worship styles with a nice bright sound then try and find a second hand technics KN 6500 or a KN 7000...

technics really have something unique to most other keyboard vendors... just a completely unique instrument - very original and advanced in both sound and functionality... the only issue is that the company is no longer in production...

I own a korg PA 800 as of about 5 hours ago. (literally i just got it today) and comming from a yamaha background, it really has an awesome live crisp sound compared to some other top end keyboards...

Also remember there is also the possiblity of downloading third party styles for any keyboard as well. you might find yamaha to have a big strength here and there is also a bit on offer on the Korg Forums I have found lately...

good luck!
Nick