Squad help

Jeditrainingneeded

Hey everyone! I am needing some help to decide what to do with my paltry credits. I never seem to have enough to promote the toons I have enough shards for. I have about 2 million and will need half to promote Dooku in a few days. Currently my arena team is 7* Lumi, Sid, QGJ (L), GS & 6* Dooku (81/100 shards). All are maxed gear and abilities. Is this a team that is my best bet with my other current options? I have the following other toons (7* JC, Cad Bane. 6* Daka (56/100), Kylo 24/100, Eeth 101/100, Poe 31/100, Tarkin 8/100, Poggle 100/100, 5* 5's 65/85, Mace 84/85, Barris 8/85, Yoda 0/85, FOTP 12/85, Teebo 20/85, Maul 19/85, Anakin 11/85, Rex 87/85, Elder 53/85 and 4* Rey 26/65, 86 115/65, 88. 24/65, RG 17/65, Phasma 65/65, Vader 51/65 and 15 or so more that I can't or haven't started farming. Level 70 toons are GS, Lumi, QGJ, JC, Sid, Daka, Dooku, 5's, Kylo Barris & Poe. The rest are between 1 & 63.
Also with the Jedi challenge, do I have a team that could beat even the 6 star event with Mace or should I try to level Anakin, Barris, or someone else since Kit is only 46/65 and Aayla is 4/65 (not farmable) Tano maybe? Thanks for any insight. It is definitely appreciated!