I confess until I saw your links I'd not heard of either. However, the contact name there for flight dynamics I knew as a groundschool instructor on ITPS before it folded - and so far as I know it folded for entirely commercial reasons, not as a result of any deficiency in it's technical capabilities.
However, my opinion is that if you can't find a major government or international corporation to pay your way through NTPS or ETPS, then far and away your best bet is to go with a major university. They are generally reasonably affordable, and have a stability and credibility that a smaller organisation lacks, regardless of the technical acumen of it's individual staff. UTSI seems to offer this being a state University, here in the UK Cranfield is the obvious place (
http://www.cranfield.ac.uk/coa/tech-ftd/ftd-6.htm), although Stewart Houston's group at Glasgow (
http://www.aero.gla.ac.uk/PGrad/menupage.htm) seem able to hold their own also from what I've seen of their work and teaching.
G