Citra is not very "citus" to my tastes. More like Mango. But I used to use a small amount of amarillo at knock out in my Belgian White ale along with Giner and Lime leaves. I stopped using it because while it did have some citrus character the hop flavor clashed with the yeast esters and made for a slightly harsh and strange character. Might work for a non-belgian style beer, I dunno.