Really good figure 8-s are a bit difficult to find in the lower priced segments. Most of the switchable LDC-s are useable but does not have that really perfect figure 8. Plenty good for testing MS though.
My favourite is the Sennheiser MKH-30. Use that together with an MKH-40 or MKH-50 and you have the same mics used on just about any film location.
Schoeps has a good figure 8, Neumann makes a small one as well.
Other really good figure-8s can be found among the ribbon mics. Very delicate animals though, not made for stealthing, and takes quite a bit of gain in the preamp, generally more than moste preamps allows.
Gunnar