I'd look at what you actually use it for. I just got the A70 for our first digital camera. Frankly its features are overkill for our simple needs and I imagine it will be years, if ever, before we outgrow this camera, or even use 10% of its features.
If you need what the other camera offers, and it looks like a good deal to you, go for it. Otherwise, stick with what you got-its a great camera.
PS-give some thought as to whether you lose your warranty be trading. I suspect so, but don't know.