Sorry, I'm going to go on a rant here.
Back when the first Slash model Gibsons came out (before the Slash pickup), there was point made on Gibson's website that the APH-1 specced pickup was the pickup used for the guitar that Slash used to record with (Derrig Les Paul copy). They even went on to quote Seymour Duncan about how a Slash model pickup was attempted, but rejected by Slash stating that you couldn't improve on perfection (APH-1). I'm not making this up. You can imagine that all of these years, Slash has had access to any number of Custom shop Les Pauls, the "cream de la cream". They always claimed to use the APH-1. Seymour Duncan was determined to find a way to sell a Slash model pickup, so they came up with a new angle. The new claim is that none of those Custom shop Les Pauls (slash is reputed to have hundreds) Slash plays live with sounded as good as the COPY that Slash recorded with! (funny huh?). Has anyone ever read of Slash complaining about this? But, with the new Slash model pickup, Slash's and even your guitar will sound like blah blah blah. Problem solved, put a caricature of Slash on the back and charge $15 more each. Oh, the Slash Sig model comes with vintage appointments such as long legged base and non-splitable bradded wire, even though it's not exactly the same pickup! Double Oh, you can get it in reverse zebra or all black! Imagine, all black just like Slash.
Your question seems to be "is the difference it worth it?"
I'm glad that there's another pickup in the line to fine tune your tone, but you said that you like the way the APH-1 sounds and that you think Slash is cool. You also said that you're on a limited budget. Think of the APH-1's tone as a pretty shade of blue. The question is, do you want to spend your money on another pickup (premium priced) that's a slightly different shade of blue or maybe something red or yellow. It's your money, but if it was me, I'd try something else if anything at all.
Wow, that was preachy huh?
