Can anyone help me decide what camera(s) to buy?

So here’s the deal. I’ve decided I want to buy 1 or 2 cameras, because I can. I’ve been looking around on http://shop.lomography.com/ and have narrowed it down to a couple of options. Basically, I want to get some description of Diana, and I also want either a fisheye camera or a fisheye lens for the Diana. My two options, as I see it, are as follows:

1) Diana Mini w/ Flash and Fisheye No. 2 camera

or

2) Diana F+, 35mm back addon and 20mm fisheye lens

The total price difference is negligible (about $4 AUD) but I guess things like film & development costs of 120 vs. 35mm could be important.

Any suggestions as to what option I should go with? (Or why I should go with neither? =P)