I use namedrive for all of my spanish traffic, and I must say I have a lot of spanish domains too. Sometimes skenzo does well with the odd spanish name. Good Luck! :tu:
For parking of out and out spanish domains - really I must consur - ND offer a great service...
At 1plus.net we are just configuring some spanish skins... Offering domain customization by language also.. If successful we will make some German skins also
I have 150 k spanish uniques parked 3/4 at sedo.com and 1/4 (mainly travel) at domainsponsor.com, I tried ND and couldn't even come close.
I think your question is too general, try them all and then decide, some names will perform better at particular PPC companies while others.....
ND are the best for spanish names becuase like you said they do the better ads . Anyways i think it looks like your the only one with a spanish domain name *cough*add a premium on when you come to sell it*cough*