I am making the assumption you want a large inverter
and charger combo, given the manufactureres you mentioned.
I have the Xantrex Prosine 2.0 Inv/Chg. Very, very good unit. Just a word of caution, if your are going to put the inverter
close (CLOSE) to the batteries, you can get by with 4/0 cable - that is 0000, not 4 gauge. If it is more than (25 ft r/t... I think), you have to jump to 250 or 350 mcm.
Just so you know, I doubt 4/0 is what goes into your house. It is VERY large cabeling. I think west was selling it for $20/foot when I put mine in. I cannot imagine how much it is now. Incidentally, I did not buy it from them. I bought it from Cobra Cable. It has to be tinned, marine grade cable so your choices become a little limited. You will also have to order the lugs for them and find a place to borrow the crimpers for 4/0+ lugs. You also must know the post sizes.
It is not an easily do-able job for the average layman. If you do not have experience in the install of these things or a good electrical background, I would consider a professional install (that is bonded with insurance, smile). I bet the install will cost you more than the unit itself, though. But at 2000 watt run and an even higher surge, you don't want to screw it up.
Just my opinions.