Matched pairs used to mean using consecutive serial numbers and/ or having the manufacturer measure all the mics and sell you the closest matching pair at a premium price. Most companies have far tighter tolerances these days so there's no need for that. Certainly not with SE anyway, their stuff is really well made.
I strongly disagree about mono overheads fitz. Mono sounds a lot
smaller than stereo. You avoid "phase issues" by using correct stereo miking technique:
My pet hate is the typical spaced pair of cardioids- almost always too far apart because most people position them by eye
at the outside edges of the kit, instead of by ear
. You end up with a hole in the middle and the snare off to the right (audience perspective).
I prefer XY. It looks
completely wrong when it sounds good! A carefully positioned spaced pair will sound wider than XY. But if you want a very small sound mono will work well.
The Beyerdynamic MCE530 stereo set is superb value for money. Very good as overheads and excellent on acoustic guitars.
Sennheiser E604 are excellent on toms but three of those is pushing the budget!
The Samson Qmic thingies are about €50, 3 tom mics. Haven't used them, but might be worth a try. The T Bone/ Karma mics are apparently great for the money, but I can't find anywhere that sells the tom mics on their own.