An Etek3, even without any upgrades, is sort of like a merge of the Ego 8/9/10 with a different solenoid. Absolutely nothing besides marketing missing from it to be a tournament marker.
Youre etek will do just fine. I see eteks all the time in D5-D2 tourneys, only when you get up to D1 do you really only see those pricey markers. At least around where I am.