Yea, Gmiui is the best miui rom out there for infuse, very stable. Although just like other miui roms, battery life isn't that great (fair but not as great as other gb roms) and you cannot charge the phone while phone is turned off which I hate.
I don't think any unofficial ics roms are going to stable enough since there is no leak to work with. I ran unofficial AOKP for about 2 weeks or so, and it was pretty solid but not as stable as other gb roms. I'm currently staying with Zeus 5.2 which had been the best custom roms for me (No SODs like Zeus 6 or ZTR) and will be wating for any new stable roms...