Why not just go to a store, and see what wows you and what doesn't?
Most here have some kind of agenda (Ian works as a clinician and demonstrator for Yamaha at the moment), and most here will tend to recommend the arranger brand they currently own (naturally!), so unbiased advice might be difficult to obtain.
Only YOU know what sound and styles you are likeliest to need, and nothing short of actually listening to them, playing them, to at least get a basic idea of whether what you hear in your head is do-able at the price point you can afford, will be useful, at first.
ANY of the main manufacturers make very adequate arrangers in your price range, including Yamaha. But only listening and playing them will make your mind up. Writing about sound is like dancing about mathematics. It's the wrong medium for a good description.
If you can't get to a store easily, all the manufacturers have sound demos on their websites... A visit to Musician's Friend or other internet retailer will give you a list of what arrangers are in your budget. Then a trip to the manufacturer's website will give you a cursory impression of the sound. After that, and maybe you have narrowed down your choices a little, coming back here with a simpler choice selection and some questions about how easy they are to record, or use as sound modules, or display lyrics, etc., and we can help you more.
Till then.... Happy hunting!
_________________________
An arranger is just a tool. What matters is what you build with it..!