This is a good suggestion, and will really be a step forward for steem.
Anyway, I strongly, strongly suggest you not to use Subversion. It is plain old, incredibly slow* and unflexible. Please evaluate going to Git / Mercurial.
Mercurial is probably way simpler that git, so migrating from svn is definitely easier. There is a great tutorial for mercurial there: www.hginit.com
I'm sure it will convince you. Please take a few minutes to read it. That's the one who convinced me to trash away Subversion.
For hosting. Sourceforge can (I think) host mercurial project. Some other/better is bitbucket.org. Sourceforge is rather limited in features, it suffers from subversion legacy.
You can browse the Atari ST manager for HxC Floppy Emulator here : https://bitbucket.org/gbouthenot/my_hxc_manager/
I just uploaded it.
To illustrate "incredible slow":
I just did a merge in a sourceforge subversion : http://hxcfloppyemu.svn.sourceforge.net ... vision=554
The merge took about 10 minutes to process (hopefully without merge conflit, subversion is really a mess when it comes to merging). And another 3 minutes to commit.
It would have take seconds in Git/Mercurial to merge and commit, and up to one minute to push to the remote server.