Well, if it sounds great from where you're standing, the closest you'd get is a binaural pair, but the good ones are seriously expensive, eg the Neumann Fritz.
The point being, to get anywhere near the amazing ability of ear/brain you need a seriously amazing chain from mic to preamp to converter.
How bout trying a coincident pair at the same height as you're liking the sound, which is probably somewhat off-axis from the speaker cone. I.e. if you are standing, and the cab is on the floor knee-height, and that is the sound you're liking from the room, stick the mics there at ear-height
Because they are off-axis you'll be getting some treble roll-off and therefore help towards a "warm" sound.
I'm sure you'll have to boost some low mids to get closer to the sound you're hearing standing in the room.
Also stick one mic on the speaker as your main sound (per usual), then blend the room mics in there --- or depending on the song why not use the room mics as your main sound for a change?