At that price the amps are pretty much all the same, in capability at least. For that money you are looking at Japanese brands, they are all competent enough if not exactly inspiring.
They do however vary in functionality and presentation, by that I mean some are a little bassier, some a little brighter, there's really not much else in it.
At present the Marantz PM6005 is available under £300 in the uk, so for many in your position it is the default choice. In your market prices might be rather different, perhaps if you tell us what is available to you?
In all honesty, as long as you avoid the obvious mismatch, bright amp with bright speakers for example, any of the amps from the reputable manufacturers will be fine, if you can audition, then try them with your speakers and pick the one you prefer, there is no right or wrong answer here.