Choosing products/installer in Manawatū-Whanganui

Planning on getting a small grid-tied system for a 2 person household. First time I've delved in and finding the brands a bit confusing. Have had 2 reasonable quotes so far:

$10.7k - Sunshine Solar - 6kW GoodWe inverter, 8x 450W Sungrow panels

$11.8k - Harrisons - 4kW Fronius inverter, 8x AIKO panels

There is space for up to 10 panels but we're not a particularly high use household and the extra 2 panels adds almost 2k...or should I suck it up and get 10?

Interested in any experiences with either company's local branch and the products mentioned. Or suggestions of better/cheaper suppliers in region.