IME taps are something where you *don't* get what you pay for. The insides of them are pretty much the same, once you've decided between ceramic and conventional washer. The main thing to look for is decent thick chroming (I've seen it wear off within a year on some very expensive taps) and a design which makes it relatively easy to disassemble. A pull-off easy-clean cover is much better than a screwed-on one, which will be sezied solid after a few months in a hard water area.
Do fit them with mini stop valves underneath (the sort that are turned with a screwdriver).