The Roland is a nice unit. But always use standard buying proceedures; Play it with headphones on for about five hours to make sure the sounds wear well on your ears. Remember that any keyboard sounds great when played by product specialists. I heard a really cheap Yamaha PS series board played by a Yamaha artist that made my ears tingle, but when I played it myself it seemed rather like an entirely different instrument.
Keep both the Roland and Alesis if you can. They're both useful and very different!