If I was you sir, I'd be tempted to put the SH4 version into hiatus status, and do the SH3 version fully, so that you can get it out and into my grubby little mitts faster...
- seriously. If it is capable of doing more of what YOU want it to do, I would go the SH3 route. We'll take it, and we'll like it, I guarantee!
Now, which drawer did I leave my SH3 disk in?...