Suckup SpiceGenMod RC1
Have you been here yet?
Search on google for suckup.de and samdroid and you'll get there.
Tends to be the most stable ROM and also the best guide on how to get a good stock version in plus then root and install the ROM itself.
Otherwise the forum for Spica is over at samdroid.net
---------- Post added at 05:09 PM ---------- Previous post was at 04:53 PM ----------
btw, if you still get stuck at the bar after resetting then let me know.
It could be extra kernel files or similar causing the boot problem or any manner of things but if you can get to recovery then try doing a wipe of everything from the main menu plus the advanced menu... Otherwise reset back to stock via Odin, but make sure you use the right one for your region, then root, then install a ROM.
And don't forget to sipe caches and dalvik AFTER installing the ROM!