Everyone seems to have recommended the EX1000 which is meant to be similar in many ways to the 7550? including bass?
Also, it doesn't have to be super strong bass, just at the same or a greater level then the GR07BE.
I found a decent import deal on the FX700. How do they compare to the 7550/EX1000
Maybe ask ljokerl in his multi iem thread? He have heard them all.