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I'm not even sure "human" pretenders are good as Rainbows, a GK is quite better for a very few more points.

For example, to get a good base A3 E2 F3 W2 S3 D2 N2, and dom 6, scales at 0, you have :
Human mages cost 385 to 400
GK costs 428
Nagas cost 480
Master Lich costs 540 (with D3) and is immortal
PoD is at 560
Oracle is at 400, but is immobile and has very few slots so should have more paths.

The difference is thus in the 30-160 range (1 to 4 scales), and I'd rather have 3 scales less and a PoD than an Archmage...