Hello New Here Mod Advice Requested

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I have a MVP 3.0 with a crown tank. Wanting to upgrade my mod. Want to know what everyone thinks of the following
IJoy Captain PD 270
KAOS Spectrum
Wismec Predator
MVP 4.0
Any others that are your favorites or ones that have a bad rap please let me know. Really needing to upgrade soon.
Also best places online to buy for good prices and stand behind their products. Please all the information from you fellow vapors is very much appreciated.
Thanks
Andrea

Hello New Here Mod Advice Requested