So I have had a sd450 for a loong time. I am ready to get a new camera and I was looking to spend around $300. I really want another camera that uses SD cards since that is what I have a bunch of. I like high iso or at least decent for a compact. I also like li-ion batteries but not 100% tied to them. I was looking into the SD750, SD850, SD870 but I don't really know the difference between them or if it would be worth it to spend the extra money for the SD950. MP over 6 is not really too important to me. I also know very little about the A line but they look pretty cool. Also if anyone has any other suggestions for cameras not canons that would fit what I am looking for I am open ears.

Here is one I would recommend. I have it's predecessor and love it.
http://www.bhphotovideo.com/c/product/483661-REG/Panasonic_DMC_FZ8K_Lumix_DMC_FZ8_Digital_Camera.ht ml

Right now i have the Canon sd900 and i really really like it! its 10 megapixels 3x zoom 2.5" lcd screen and loads of cool features. it takes awesome macro shots as well has really nice shots from far away. it also has wonderful colors :) you can get it at beachcamera.com for 299.00 i believe.

good luck!