Distance to develop or different perspective? (+ & - some room contributions.
A close mic on the cone should couple quite nicely.
the distant mic was for the low frequency to form completely. from what i was told it is suppose to take lower frequencies longer to be recreated more accurately. in theory it is suppose to add more low end to your tone.
also as far as gear, i do recommend the sansamp. i have had both the bass DI foot pedal which sounds great and the programable sansamp. i currently use the programable one because i change tones between some of my songs. it is also very useful for recording vocals.
other di's that i have used are
the Eclair Engineering Evil Twin. that was the best DI i have used so far. i should have picked it up when i had the chance. the other one i like is manley stereo tube DI. also a good choice but you cant tweak the tone as much.
as far as mics go a good do all mic is a SM57. you cant go wrong with that if your on a tight budget.
or amps and cabs i have gone through a lot of changes
i started out with a mesa 400+ with a ampeg 2x15
i like the tone once it was set for the day but the tone would change the second it was turned off.
then i went to 2 eden world tour 800's with 2 eden 4x10 and 2 eden 1x15 cabs
that was a very cool tone but i had over heating issues with the heads
after that rig i went to 2x ampeg svt 4 heads and 2 ampeg 8x10 cabs and sometimes a ampeg 2x15
that was the most reliable rig out of them all with very cool tone and plenty of power to spare.
i have also toyed with 1980's svt classics and a few of the new one. they have great warm tones and would highly recommend one.
also from what i read the older svt 2's a very similar in to to the classic.
hopefully that answers the mic question and gives you all a few more ideas for gear.