My suggestions would be the roller by Atmizoo, the 69 mod, the Gus telescopic mod or the chi you mod. Prices range from $120-220 and you can get them at vape revolution in California. They have a brick and mortar store or you can order by phone. They Are great to talk to and very helpful answering whatever you throw at them. Also consideration would be button placement. Button on top or bottom. Hope it helps. I originally had a veryong detailed message about these mods but I think the forum farted or something so this is the short version.