Neo 410! Seriously though, the Backline 600 is great for the price. Solid, and great GK tone. I'd get the heads and cabs first, then work from there. They will define much of your sound, and pedals can refine it further.
Gallien-Krueger Club #909|Lefties Who Play Righty #304
Soundgear Club #182|Ibanez Club #1006 | Darkglass Club #48 | Joyo Club #11