In reply to Exocet:
I've been in/around March over the past few years. Grade-wise the standard definitely tends to be best in/around the 6&7 mark, with sectors being both in/out of the shade (depending on the time of year). March has always been quite nice, with it being sunny/warm (a welcome relief from life back in the UK), but equally shade being there if you need it.
Terminal Area Crags is essentially the 'go-to' area, with the namesake 'Terminal' being the jewel in the crown and Erboristeria (right and left) both having a plethora of three star classics. Other more esoteric venues such as Red Up are well worth a visit, although it does depend on the grade you're climbing (Bob (7b), the crag's classic 7b, is worth travelling for - it's amazing).
Elsewhere the Colletta Crags (such as Colletta Crags and Bausu Crags also offer a good spread of routes, with a lot in/around the 7a grade.
Hope that's of use for now. Sorry if the grading is a little out on what you're after, but I figured I'd fire some info across from my own personal experience.
If you do go, enjoy