Very good question - and one for which I don't have an answer.
The SideKick Sport was a short (three year) production run, as compared to the earlier SideKick (nine years) and the later Vitara (six years) and was a more expensive, less popular vehicle than the SideKick - because of this, there are less after market parts for it, and locating parts will certainly be more challenging - you may find yourself at the mercy of the dealer.
The reason I drive a Suzuki (I have two - a '93 Swift & a '98 Grand Vitara) is parts availability - I can walk into my local dealer and walk back out with perhaps 90% of the mechanical parts I'm going to need - anything else would have to be special ordered, at which point it becomes cheaper for me to source it myself from the US - before buying the GV, I did consider a V6 Vitara, but chose not to buy it, and one of the reasons was that I foresaw challenges locating parts - like the SideKick Sport, the V6 Vitara did not have a long production run and was made in relatively limited numbers.
To be honest - in my first response, I wanted to list parts availability as a reason not to buy - were I the one making the choice, I'd try to find either a good 1.6 SideKick (the SE series) or a Vitara/Grand Vitara (99~05 - the SQ series - this last is what I have, but it was not sold in the US untill '99) - let me make it clear, this is largely personal preference, but I have personal experience with all three series of vehicles - albeit not the 1.8 SideKick Sport itself, but the v6 engined version - it's a good vehicle, it's a strong vehicle, and if properly maintained, a reliable vehicle - I just am not willing to be forever on a parts hunt.