I'll second Kare's recommendation of Warder. It's true that if you use da Silva's Primer, you will reach the point of diminishing returns quite rapidly. It's useful for a broad survey of the cases and conjugations, which is something that Warder's 1st 16 lessons were also designed to achieve. What's superior in Warder is his in-depth treatment of syntax that is unmatched. Pali syntax and grammatical constructions are sometimes obscured by enclitics or even words in a construction being distributed far apart in a clause/sentence. You won't find such structural analyses in other Pali textbooks.
Just bear in mind that Warder envisaged his Intro to be used as part of a 3 semester course in a formal setting. Since I've stopped my Pali classes, I guess I will have to distribute Warder over many more years of self-study before it becomes 2nd nature. I guess some formal background in Linguistics will give you an advantage, so that you won't have to check up on things like nominal, pronominal, adverbial etc etc. The ability to translate sentences only come after Lesson 27, when most of the hard work has been done on syntax.
So, while you grit your teeth in frustration before Lesson 27, you will still be able to easily understand how words are related to one another within a small turf of text. In fact, with the 1st 16 lessons, you will have learnt enough about compounds to audit how translators parse these annoying creatures and decide if a translation is legitimate.
Welcome to the Dark Side