well since u r a warrior and need to stick to common drop eggs more or less.. a few choices would be....
Vanquisher ( almost a must for you since it is also needed on the knights table and will help you there.) so instean of building 3 mains and a vanq for knights keep working on a vanq as a main.
Venus sage & WAD are inexpensive, and easy to get.
Patk is decent but like a vanq is all atk and no def, so if u use both a vanq and a patk, then you need to be sure u have a high def pet also, in both mdef and in pdef.
Patks can be got fairly cheap if u do it right
another option is to use 2 warriors and a mage pet. if a mage then use a vanq and a warrior that has pdef also. ( wad, venus)
if u use a mage then there is mad & blood sage.
these are the pets that can be made in game for no eps at all.
pdefs are great but a hard build and get costly if u cant find enough eggs for gold in market.
If my info here didnt help u r u arent satified with it let me know and ill try again
ty
and keep in mind tht as the game progresses u may run into ways to make a little ep in the game and be able to change out pets later
but for starting out i would start with these common inexpensive to star pets