SF...I started much the same as you...Vaping nirvana to me would be a system that provides adequate vapor, easy to operate and cost effective...I've spent quiet a lot of cash getting things working smoothly...I've never tried a Mega in a 510 platform because syringe ffilling to me seems to be quiet a pain....My cartomizer of choice is IkenVapes Mega 808,,,condom filled at first and fed thru a Super-T tip from that point...They last a good long time with many fills...MANY..I also throw on a MadVapes SLB 901 from time to time just for a change...Also fed through a Super-T...I've got a Black Bullet, Silver Bullet and a GGTS....I never use them and I'm just keeping them around as backups...The Buzz is my PV of choice...The voltage is variable but the best feature is the voltage does not start at 4.2 and then drop well below 3.0...Through the cycle it remains a constant 4.45...Constant start to finish adjustable voltage is easier on the carto or atty..It simply makes them live longer...providing the best vape possible at the same time...That system is a little more costly at first but cheaper in the long run....