Which Heineken Cup quarter-final will be the most entertaining?

Question

Munster v Northampton has the potential to be a classic, but it's widely expected that the Irish club will be too strong at home for their opponents. Biarritz v Ospreys, likewise.

However, Toulouse v Stade Francais has all the ingredients of a thrilling clash; while Leinster v Clermont could also prove decisive in the race for the trophy.