I have bought many arranger keyboards over span of 15 years, changing every 2 or 3 yrs/sooner. The best advice from me is to buy one from a retailer that offers money back guarantee like Guitar Center which also offers price match provided you show them a print of the advertisement (from a music website like music123.com). Just about every keyboard that I bought had some shortcomings that I really disliked and only found out about it after using it for couple of weeks. I thought the highly touted KORG PA80 was awesome, well after some frusrating days of pushing knobs, etc to get what I want to do, I gave that up and never regret that decision. And many other examples. None of them are perfect but some you can live better than others. You just need to try it for a few days.

Currently the best out there and can still be found quite easily/practical is Yamaha Tyros and Yamaha PSR2100. And also the KORG PAx. Basically just KORGs and Yamahas. Not much choice, huh !

The other high end arrangers like Technics, Roland, Ketron and Genesis are also top arrangers but much much harder to find and the price/performance ratio left much to be desired IMO.

But personally, I like the outstanding keyfeel of the low end keyboard of Yamaha DGX500 but the current model has a shortcoming that I really dislike (you can search for discussions on this on older threads). It just makes me want to play it more and more. There is a new model coming up this year in the same model that addresses some of the bugs.