There's three of us going to Jerez in April with Focused Events (although I think its full now...there might be a reserve list). I know Tracksense have some deals to Almeria at the end of February and in March, and Jerez in May:
www.tracksense.co.uk Almeria and Jerez are both great circuits, and I wouldn't worry about not being a "track-god"...I am at the slow end of the intermediates, and I have always had a great time on European tracks. Normally more friendly than UK days, as everyone tends to be in the same hotel, and there is normally plenty of help and advice available in the garages and at the bar in the evenings .
Inclusions in the price tend to vary from operator to operator...their costs are going to be similar, so I think you end up paying pretty much the same whoever you go with.
Focused Events appear have a few spaces to Cartegena on 3rd April. Can't comment on the track, but I would recommend their European trips. Pretty much everything is included (apart from a surcharge for getting your bike picked up locally to you, rather than delivering it to Diss), and they really hammer the safety aspect in every morning.
Overall, I can't recommend European Track days too highly...great fun!