I went with Renogy 100 watt 12volt panels because of the small width of the panels. With 24 inch width I can put maybe 8 panels on my roof and still be able to walk around. Right now I have four.
I decided on a 30amp MPPT controller and ran the panels in series so I don't need heavy gauge wire for the run to the batteries and with MPPT some of extra voltage is converted back to extra amps.
Whether you buy MPPT or PWM get a charger with extra capacity so you don't reinvent the wheel every time you add another panel, and you will buy more its addicting. And, even if you do have to buy another controller its not the end of the world they all can piggy back on each another at the main battery connection.
Ron W.