vintage 30's work well with engls. I haven't tried too many other speakers, though.
as far as I know, and mainly from what I hear (if anyone else knows better, listen to them!):
1. speaker type : for this im pretty dead set on vintage 30s
2. front loaded or rear loaded: can someone explain to me how each way effects tone?
3. cloth or metal grill: not sure how they differ in sound either
4. angled or straight: do they actually sound different or just look different?
1: sounds good.
2: from what I hear, front loaded sound a little more "immediate" (EDIT: or punchy) for want of a better word.
3: I'm not sure either. I'd guess it's slight, maybe the cloth is a little more vintage/softer/warmer sounding?
4: straight normally have more bass, while angled projects the sound upwards a little more (if you're using them in halfstack format)- so it's a little more in your face (in terms of the sound actually getting to your face, not the slang term!).
I'd guess something along the lines of an engl xxl cab would do well for the se, if you can afford it- the se has a load of bass, you need a really good cab to get the best from it. I'm sure there are other good cabs too (genz benz g-flex, etc.) for it.