I have found that my first e-liquid is still one of my top favourites too. I wonder if there is somethign in that? I first started on Dekang RY4 mixed with some Tactical Orange from Tootin' Juices and I still love it just as much. Although I don't vape it a lot now because I have a whole heap of different juices now. I still go back to that though.
My favourite right now is Brasileiro from House of Liquid's El Toro range. Can't beat it. ADV for me right now.
If you like fruit flavours I can recommend Hangsen grape. It has a grape sherbet taste to it. Delicious. Or Vapour World Banshee if you like 'nanas. Tastes like those foam banana sweets. Very moreish. Easily vapable.