[Q] Paranoid newbie questions re replacement ROM

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http://forum.xda-developers.com – I have a Galaxy Gio GT-S5660V (Australia) with a 16GB SD card, having (currently) a 500MB ext2fs partition in addition to the FAT32 partition. I've rooted the phone with universal_gb_root_v20.zip and moved everything that can be moved to the SD card. But I have installed some 42 additional apps (on top of those that came built-in), and despite uninstalling some built-in apps (using Titanium Backup Root Pro), am forever running out of storage. To the extent that I now can't update some storage-intensive apps (like Google Maps). I know this is a developers' forum, and I'm not a developer (HowTos)