First, I suggest you forget about the 4-position Q switches, these are not standard and would probably take extra time and money.
Mark says that for about the same price, you could get:
a) toggle switches for bass/treble, and 3-position Q switches, or
b) knobs for bass/treble, and 2-position Qs
If you could spend more money, the best choice might be:
c) knobs for bass/treble, and 3-position Qs
If you cannot afford (c), then Mark would choose (a). He does not find a use for the extra cut you get with the bass/treble knobs. He also feels it is more important to have one extra Q setting.
3-position Q is much better than 2-position. The standard 2-position Q is 0/8dB. 8dB is a lot. If you really like Q, and want a switch that makes a big change in sound, this is fine.
But some people find that 8dB of Q is too much, and would almost never use it (a wasted toggle). Instead, they choose a 3-position toggle, with values of 0/3/6dB (or maybe 0/4/8).
Like the tone controls, it depends on whether you want to make lots of small changes, or just a couple of big ones.
I agree with Mark that 3-position Q, with small range like 0/3/6, is much better than the standard 2-position Q.
I do not agree that I would give up bass/treble knobs. The in-between settings with bass/treble knobs are much more important to me, personally, and I sometimes do use the extra cut.
If I could not have (c), I would choose (b) - but change the values on the 2-position Qs to something like 0/4. (Really, I would just borrow some extra money and get 3-position.)
My taste is different. I don't think I would ever use 8 dB of Q, but many people like this. Many people are also happy with toggles for bass/treble.
I was glad to see that you decided to get the bass/treble knobs, I think you will like them. If you can afford to spend a little more, 3-position Qs would be worth it.
I think again the choice is whether you like small changes, or big changes.
I hope that helps.
-Bob