I love my smok h-priv, can get it around 45 bucks and its powerful enough to zap any atty I want to buy in the future. The chip got great reviews here:
Upgradable firmware thats used in a lot of other smok mods and no firing delay anymore. It also has great battery life and looks really cool. Just as any mod though, make sure you use high quality batteries. I personally prefer the lg hg2 and have never had an issue with them. I have some vtc5 batts in it now and they're pretty good too.
Another thing to considder is what tanks/rdas you plan to use on it. Not really power output, there are only a few tanks where you'll actually use more than 150 watts, but dimensions. For example, I have a dripbox 150 that only takes 22mm rdas without the rda hanging over the edge of the device.
I hear the sigeli 213 only puts out about 155 watts, that video is here:
Now, I trust this reviewer not to be bias, but that is just me. I encourage you to thoroughly research any product you choose to buy. It's saturday now, my suggestion is to spend the weekend watching various reviews, and find the pros and cons of every device youre thinking of buying so you can buy a mod that meets your needs.