I'd go Thoth as a first stop; all the astrological signs and decans are marked on each card.
Mind you, it is very hard to look past the Tabula Mundi for a deck that blends all the woohoo, beautifully, in a symphonic way. The deck can be augmented by the addition of the twelve zodiac decan cards. Parts of images, symbols, signs, repeat throughout the deck to immediately help you get a visual idea of what cards are related to what and how. It's terribly clever.
The Golden Dawn system is fairly straightforward. I've attached the circle diagram from Robert Wang's book The Qabalistic Tarot (1983, revised 2004, Marcus Aurelius Press).
In the diagram read:
King - Thoth Knight - RWS King
Queen
Prince - Thoth Prince, RWS Knight
Princess
The switch of the attribution of two Hebrew letters isn't going to have any major impact if you're just mixing Tarot and Astrology; that Tree is a whole other thing.
Note though how the Knight (arguably RWS King), Queen, and Prince (RWS Knight) all straddle three decans. While the Princesses (RWS Page) and the Aces straddle a quadrant. There are some basic, flowery, and even poetic explanations of the whys for that. As for the whole Knight/King thing, I really think it's easiest to think of a Thoth Knight as a RWS King (although there are subtle and telling differences, best left for more in-depth study). Think of the Thoth Knight as just a King, who isn't welded to his Throne, he's out there getting on with ruling his realm, striving, conquering.