From my experience, the 3-pack was a terrific upgrade to the $1800 Jupiter 2000. I can't speak for other players in roughly the same price range: Arcam FMJ, Musical Fidelity, certain Cary models etc - some of the newer machines "may" be significantly better than the Jupiter. That said, I love the 3-pack- they sound incredible, they have excellent build quality and they look very cool sitting on my shelf with their cool blue LEDs and all....
In terms of cable cost, I suppose that depends on what your requirements are. I bought a used DH Labs D-75 digital from Audiogon for around 50-60 bucks - the best value in a digital cable, IMO. As far as ICs go, you need just one extra to accomodate the X10 - I always have several lying around so that wasn't an issue for me.