It depends on the price of course. but then again it may not matter. Us desktop users can just drop in whatever drives we want but you can only fit two in.
n the U.S. The momentus and other hybrid drives are getting quite good prices. they have about the same failure rate(roulette basically) so its not a big problem.
Personally I would go with an SSD and a huge HDD but you probably cant and don't have the money for that.