Julio,
Hi again I just posted a response to you on the "All Talk" forum. Probably one of the best folks to talk to will be BACC "president Tony Ripepi (actually everyone in BACC is a President). Tony has both a SPF and a Unique so he can give you a very good comparison.
See you at Athens................
Mike "monster"
oops, Sorry I just re-read my earlier post and noticed that You are looking at ERA and SPF my mistake. Tony and the others can still provide you some great info