Maggies and ARC are great by themselves and they are even greater together. The biggest challenge with both is shipping heavy or large items if you need service - which shouldn't be often and both offer great service, but since you are in their neighborhood you can bypass that issue.
Their new gear is good and their older models can also be very good. They used to be the same company (back in the 70s) and still today their speakers and electronics have great synergy. Maybe you can do better with some combination, but not much better - and if you get the right Maggies with the right ARC electronics in the right room, you won't likely be looking for anything else.
Try the 1.6s or get a used pair of 3.6s and then try the right ARC tube equipment (new or used). I'll bet a pair of 1.6s with a D70MkII and an SP3A-1 or a SP-8MkII would send you into sonic bliss (depends on how loud you need to listen; Maggies can consume some power, and bigger ARC amps will cost more than a tad). There must be some Minnesota audio club where you could hear such a combination.
- One other wild idea for you; find a pair of great condition Dahlquist DQ-10s for about $500-$600; they will provide excellent midrange, decent highs, and decent bass and leave you with about $1k toward the D-70MkII and ARC preamp.
Texsun and Flrnlamb are right; all speakers, especially in the $1500 price range are going to have their limitations; the DQ-10 vintage ARC electronics system will not have the lowest possible octave, but it will go reasonably deep and tight and the rest of the frequency range will be there with great openess/air, detail, and imaging; until you spend a bunch more on a system it's going to be hard to get to the next level - and even then you're not going to get there unless you have a great room. A word of caution: you are pushing not only the 80/20 rule (80% or more $ for a 20% or less improvement in sound), but you are at a level of refinement where the room can easily limit progress if it doesn't have the right size, dimension ratios, and surfaces. You are on the threshold where dollars and time can easily be consumed with minimal progress achieved.
On the upside, the biggest sonic breathrough I see in front of you is a tube-based system.