Coming back to Warframe, need a little help

Im coming back to warframe having fun leveling up with my friends, currently mastery 5 and i just maxed out my ash prime, i know he got reworked so i was wondering what are some good warframes to help with clearing/aoe in a party. My other warframes are Volt, Valkr, Rhino, and Frost Prime, only maxed is volt, i got some plat left over from last time so i can buy another warframe that are a must for group.