5kw or 8kw inverter hybrid sysyem question

Hey guys. 

Very much a newbie in the whole solar off grid thing. Sorry in advance for the long winded message. I thought the more detail the better. I recently bought a house and I am planning on getting an inverter hybrid system installed and later down the line (6 months or less) will add solar panels a year or two later. 

I have been researching and reading up on systems, batteries etc, but it gets quite overwhelming.  

I do have a gas stove, air fryer (around 1200w), three tvs (1x55 inch (200w), 1x43inch (150w) and 1x75inch (300), gaming laptop (around 200w from power brick) and workstation laptop (150w from powerbrick), 1500w microwave, Bosch Fridge (around 250w), inside and outside lights. I plan on getting a security system installed with cameras and electric fencing at a much later stage (a year or two later). I plan on converting the geyser to a solar one as well. We also have about 4 mobile phones a tablet as well. Obviously everything isnt used at once. Would a 5kw inverter system with two 200ah lithium batteries be sufficient or should i opt for the 8kw with the same batteries? 

Also i take it that gel batteries should be avoided? I know lithium is the best and has a much higher cycle limit vs gel, but just getting some additional opinions as well. 

Regarding brands, im still researching these so dont have ones in mind. I have been looking at the SolarAdvice website though at brands and options. 

Thanks in advance for the feedback and again sorry for the long winded message. 

Faeez.