Although i've seen neither of the SPs you mentioned, i've read their reviews.
Sadly, boobs of that calibre aren't really on the local scene. Agencies seem to be against the hugely-endowed babes

Morgan @ Luxus and Nivea @ 6456 we're probably the only girls in the heavy hitter range but they're long gone...
Best to keep an eye on the visitors like:
Amanda Devine (probably the biggest enhanced tits you'll get your hands on)
Alexiss Gold (enhanced, very fair rates)
Vanessa Jolie (i've yet to meet her, but she's got natuals)
Locals:
Camrielle (biggest naturals you'll find on a fit-ish body, MP only)
Yasmine Love (sadly, dealing with personal issues for awhile now)
and of course there's Classy Angel (enhanced. her rate is out of my range but solid reviews)