Only that I'm not sure that a HW30 is really the comparable model to upgrade from an RS20. The Sony doesn't have anything like the same native on/off contrast and I seem to read many posts about the poor lens that this model has. In fact even the replacement model HW50 doesn't seem to have a fantastic lens judging from early reviews and seems to rely more on the built in sharpness (RC?) feature to 'make up' for the softer lens.
However, have you read the other thread just below this one where another RS20 owner heated up his RS20 and got rid of the pink stripe? It seems a bit 'kill or cure' but maybe an option as a last resort.
Zooming: Been there, done that, bought the lens...now using e-shift.