Which card for travel to Portugal, Spain and Morocco?

[eurouser]

We have a new unlocked SonyEricsson W580i, but I have not removed the AT&T branding. I think it will take the SIMS just fine (I hope).

We will be traveling in July to Spain, Portugal, Morocco and Germany. We will only be in Morocco for 4 days, 7 days in Portugal, 6 days in Spain and 21 days in Germany. Our plan so far is to get a UM+ card to use outside of Germany and to use the Ortel Mobile card in Germany. All our calls from Spain, Portugal and perhaps one from Morocco will be to the US and Germany. We will make about 5-10 minutes of outgoing calls per day. We will forward our US number to the number(s) we get in the EU and expect about 5-10 minutes of incoming calls from the US per day. Are there issues I need to be concerned with about getting calls to connect from the US? I have read a thread here about callers in the US not being able to get to UM+. Is this service an unusually expensive number to dial from the US?

We would like some feedback as to whether this is the best plan or if I have overlooked a better alternative. Since we leave in less than 3 weeks, I need to make my mind up very soon. Is our plan the most affordable for *reliable* service?