The Canon Pixma MP180 is the more fully featured version of the entry-level Pixma MP160. The two printers share the same basic engine, which means their print speeds and print quality are identical. For a mere $10 more, though, the MP180 offers tons more features, making it a better choice than the MP160.
Unlike the MP160, the MP180 boasts a built-in media card reader for PC-free printing (both models include a PictBridge port). The slots read most media card types, though some will need an adapter. You can both read from or save to the memory cards. When using the memory card reader, you can print an index sheet of the images on your media card, mark the images you want to print, and scan the index sheet; the printer will print just the pictures you've indicated. There are more options within each task, as well. When copying, you can designate up to 99 copies, scale up or down, change paper size and type, and adjust print quality. Additionally, you can make sticker copies, borderless copies, and image-repeat copies.
The MP180's control panel is also more substantial than the MP160's. Dedicated task buttons let you switch between photo printing, scanning, and copying, and menu navigation buttons let you step through the menus on the two-line, text-only LCD screen.
With all these extra features and the same excellent print quality as the MP160 (and unfortunately, the same subpar scan quality as the MP160, as well), we recommend you pay the extra $10 for the MP180.