If the RS2's are the "classic" original ones (almost certainly they are), then you'll have a highly characterful and often magical little box there, BUT with reservations on partnering equipment (I sold these enough at the time).
These do have a tweaked response which favours "musicality" and an "enhanced" soundstage over clinical flat response etc and in the Tangents of the period (TM3 and 1/RS2 and 4) it worked really well as long as very high volumes were avoided. They did need a little more power though as sensitivity wasn't their strong point. HiFi Choice "recommended" them too, which is no mean achievement (yes, I do have a copyzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz zzzzzzzz)
Regarding amps, a properly fettled A&R A60 would be the minimum I think. One of the sweeter Japanese integrates being re-discovered (some of the Luxmans, Sansuis and Denons from the mid 70's - the NAD 3020 may be too bloated possibly) would work I think. A mate's Sony TA5650 V-FET amp was lovely with his RS4's, but all of these amps will need preventative service to certain caps and diodes, if a fatal (to amp and speakers) blow-up is to be avoided, as happened to his sample (check on the vintage-knob site as there's some info there).
Ideally, a bolt-up Naim would be PERFECT for these Tangents. very rare now, as they're collectors items but a re-built 120 power amp (or bolt-up 250) with suitable preamp (not so critical) will be a true marriage in heaven. A top notch source (vinyl or CD, it doesn't matter - if it's a good one) will be needed as well. The LP12/Grace 707/Supex 900E being ideally "adequate" then, or possibly a VERY well fettled Rega 3 with original R200 arm and one of their cartridges I think, or possibly a Grado or Stanton 681EEE at a pinch (for sweetness sake).
Tear down these walls; Cut the ties that held me
Crying out at the top of my voice; Tell me now if you can hear me