was also looking at other mods such as the p3 too but
Dude, I can't stress this enough to you. Get what you want and not what the Vaping Underground Peanut Gallery is telling you to get.
In particular ME!
The thing is when you ask a group of vapers one question, you will get 20 plus different answers. And they are all right in their own way. And we all have our most favorite vape toys and we are loyal to them.
IMHO, 30 watts would be just fine for you. Hell I have a freaking 100 watt mod and I don't go much over 20 watts with my RBAs (rebuildables).
And I have a Vaporshark DNA 20 for when I am out in public and want a low profile and I use a Kanger ProTank 2 on that and it works fine for me.
As far as RBAs are concerned, if you are like most of us, EVENTUALLY you will get into them.
And they are just fine for on the go as well. The builds if done well (and it ain't that hard) last for quite awhile. And you can always carry a spare clearomizer with you if your build goes south on you during the day. And once you have them and know how to build the suckers and once you have the tools, wire and wick they are a lot cheaper to run Vs replaceable heads.
But whatever you get, invest in Quality!
And never, ever, never get the nice shiney new vape toy as soon as it hits the shelves. Wait for a few months and read the reviews from folks that have been using them for a bit.
Going to take my meds now........................