Firstly, the Crimson Guitars Frettboard Restorative really is the best thing you can clean your fretboard with BAR NONE. Not only does it really clean your fretboard (far more so than lemon oil) it also conditions it and as it made with all natural ingredients, your not messing with any harmful chemicals. It's about the same price as lemon oil too and comes with two bottles. One bottle opens up the pores slightly on the fretboard and the second cleans and conditions the fretboard. I thought the fretboard on the new Spector looked pretty clean until I put some of this stuff on it, holy crap - there was a LOT of dirt on there!
Currently I've got a set of Dean Markley SR2000 strings (45-125) and they're really nice. They have the tapered ball end which suits the Spector locking bridge perfectly. It's the first time I"ve tried these and they're not bad at all although they wouldn't be my first choice but if I saw a new set going cheap I'd recommend them to anyone.
The Spectors I've seen (Euros only) come with D'addario Pro Steels which really are a great standard string for use on any bass. I'd recommend them for any bass. If you can afford it, the D'addario NYXL strings are even better. Superb strings with a great tone. The holy grail of bass strings for me are DR Hi-Beams which (when I can afford them) I always go for. They're just so bright and last a hell of a long time. They also compliment the Spector sound perfectly.
As much as I hate to bash a British company, Rotosounds really don't do it for me which is a real shame as they're a local (Kent) British company with a history and heritage that NO other string company can boast. However, I just find their strings rough and they don't stay bright for any considerable time. I've got a set on my other Euro 5XL and they're dead already after just one month which is a real shame. I'm not saying they're the worst strings out there - not by a long chalk but they don't do a set to rival D'addarios or the Hi-Beams.