I wear nothing but thongs from Victoria's Secret. My daughter is the same way.
I love NO panty lines and they are comfy. My favorites are the new all cotton line. Daughter wears the PINK line of VS merchandise.
Now, Soma Intimates at Stonebriar advertise some no show undies. I've never tried them but you might check them out. I have not seen thongs advertised there. I tried a couple of their bras and they were not bad....better than VS as far as being supportive. I just bought some new bras at Neimans and I'm very happy with them. I've not tried Neimans undies though... I don't mind paying for quality.