hi mate, hope all's well, nice to have a new band, result to have a good singer!
My tuppence worth. As is the case with amplification generally, it's a good time to buy the (tried & trusted) old, big and heavy PA gear, while in the used market the lightweight/smaller stuff can still be quite pricey. Unless you want to be doing this again in a year I'd also suggest getting more power than you think you need in case the bigger gigs do come in, or in case you find yourself playing in rowdy pubs (you can always turn a powerful PA down after all).
Having said the abkve, we play through a relatively small and lightweight Bose setup which we picked up used for not much more than the budget above (albeit without a mixer) and I'm always amazed by just how much it can pump out.