For the OP, if you've only been seriously shooting for a year or so, I would wait to upgrade bodies. Unless you really are going to switch systems. Otherwise, invest in lenses.
Obviously, if you're switching systems you want to do it as early as possible - before you're heavily invested. But, photography wise, a new body isn't going to do a whole lot for you... A flash system and/or good lenses will.
There isn't a dSLR on the market today that won't take incredible images. You have to be pretty impressive before you start to be limited by your camera body. However, inexpensive lenses will hold you back. So will inadequate or poor lighting.
Often, it's newbies that will churn through camera bodies. They tend to overemphasize the significance of a different feature set. From what I've seen and heard, the Alpha is a great camera. The reasons you gave, "versatility, mega-pixels, quality, technology" are so indefinite that it's hard to see where you feel constrained by the camera you've got.
So, my best suggestion... buy a good flash and start to learn it inside out. Really want to see a difference in your photography? Learn how to get it off-camera. Next, buy some good glass. Kit lenses are great for most consumers... but if you're starting to invest in classes and equipment upgrades, good glass should be at the top of the list of priorities.
Let us know what you decide!

)