I recently got a pair of NT5, and I really like them; I think the capsule on them is similar (if not the same) to those on the NT4, so the sound shouldn't be too different. IMO, the NT4 is useful if you plan on doing a lot of stereo recordings, or field recordings, where a single mic to handle is mor practical than two, plus it's already configured with the right XY angle, so no hassle. OTOH, it gets you stuck with XY, and it may not be the best stereo technique for all applications; the stereo matched pair of NT5 are in that case a better solution, on drums OHs you could experiment with placement (as each kit/drummer is a different combination), and still put up an XY (or other stereo technique, I like ORTF) if needed, being them a matched pair (I use mine as spot mics on strings, acoustic guitars and drums OHs as well).
The sound is quite similar to that of the Neumann KM 184, maybe not as bright, but still they are crisp and open mics with a rising peak at about 6KHz and a fair mount of proximity effect when really close to the source. I think for the price they are really good (if you're in Netherlands check the price at Thomann Musikhauss in Germany at Thomann Musikhauss , they've got really good prices for the Erupean countries).
For the Bass drum mic I like the Shure B52, dynamic, as it almost eliminates the need for EQ in mixdown, being already tailored for bass drum response, with the "cardboard" frequencies already scooped, and really takes a lot of SPL, really good for rock kits. On lighter (jazz or blues kicks) I like the Sennheiser E602, a little less boosted on the edges.
Hope this helps