Best will be hard to choose, and it DOES help that Trails won't be out for over a month past the others.
HOWEVER, if you want the safest recommendations? Just grab Dragon Quest VI and Radiant Historia and wait on the others, Xseed has been great about getting their games on the PSN, and TO's up there too, so it'll take much longer to permanently miss out on those.
^ This. Dragon Quest V seemed to had a low print and Atlus is known for their titles going out of print quickly.