Hi there. I have the SX130IS, and I have seen a few samples from the SX150IS too. If you are taking images at ISO 80, there is still a fair amount of noise compared to more expensive cameras. Bit if you get your lighting right, and exposure right, they can look relatively noise free. Also, you are starting off with a lot more resolution. 14 megapixels for the SX150IS. For the SX150IS, resizing to half height and width still gives 2184 x 1627 images.
If you would like some samples from the SX130IS, just PM me. However, there probably are better cameras around for the price. The "SX" (super zoom) series have small sensors, and a lens optimized for maximum zoom, not maximum clarity. The lens is also slow.
Another thing to take into consideration is this. Do you like bokeh? (background blur). I used to own the Powershot A640 (I think its the same lens to your A560).
These are 2 HUGE differences between the lenses, and some smaller ones, especially for macro:
1) The SX130/150 is 28mm at its wide angle (vs 36mm for A560/A64), and when taking macro images, you need to get MUCH closer to the object to get the same effect, compared to the A560/A640. I often find Im hitting into and touching the object in question.
2) It is nearly impossible to get any background blur with this lens. Everything is in focus. Whilst this can sometimes be good if you want this effect, quite often photographers want the opposite, and they spend lots of money on lenses with the ability to have wide apertures that can blur the background.
3) Aperture is F3.4 wide open (smaller than F2.8 on A560)
4) Distortion! At wide angles, the image is distorted on the SX130/150.. and the image is processed via the camera's software to correct this. When you shoot RAW, you get the uncorrected image, and have to manually fix this distortion too.
5) The camera does not give the sharpest images at its wide angle setting (used for macro), it tends to be nice and sharp at about 50-60mm.
If you have any other questions, PM me.