Honda obviously recommends its own oil, but prices have become utterly ridiculous.
To give you an idea, the cheapest I can see 4 litres of Honda Green Oil delivered is £63.44, which is £15.86 a litre. I have been using MOTUL 0w-20 Hybrid oil which I buy from Opie Oils for £46.90 including delivery (they also sometimes do 10% off). Anyway, this is equivalent to £11.73 a litre.
The £4 saving or a so a litre is not massive, but Honda's prices have become absurd and there are some fantastic oils available which do just a good a job, if not better (MOTUL are one of the leaders in car lubricants and oils globally).
I don't know what you can buy in Spain and the cost but if you can't get MOTUL's 0w-20 Hybrid oil, a good quality fully synthetic 5w-30 would be idea, especially given your mileage.