You don't really need super-accurate components for guitar circuits. They don't hurt, but they don't necessarily help you either. Most guitar manufacturers use what they can get in bulk at a good price. (Leo Fender was a notorious skin flint.) And in fact, a lot of what makes vintage guitars valuable is the character that comes from INaccurate components.
In short, buy what you can get easily and see if you like the results. Also, don't be afraid to experiment. Caps and resistors are cheap and passive guitar electronics are very robust. You can't really do any damage (as long as you leave the delicate pickup windings alone). In short, go for it and have fun!
Q: How many guitars is enough?
A: Just one more...