This is still a work in progress, since I'm still trying to determine how to flash the F900 from the SD card. But, a bunch of people have been asking for a "lite" version of the F900 ROM with all of the ACER stuff stripped out.
Here's a link to a "lite" F900 ROM:
http://www.4shared.com/file/11515883...RBO4V_101.html
With this ROM, I had a total of 176.25MB free storage space, and 56.4MB free RAM after a clean boot.
After installing this, you'll probably want to install one or more of the ACER cabs to make the phone a bit more useable, you can get those here:
http://www.4shared.com/file/11516116...S_1002_EN.html
As soon as I get the flashing from the SD figured out, I'm going to remove the rest of the crap from the rom (Office mobile, the junk mms bitmaps and misc sample music and pictures that are installed).
Justin