Looking for suggestions on good but affordable voice gateways.

I’ve recently went from a fairly large telco company to a small but fast growing ISP. At the new company we are preparing to launch voice and I’m trying to help select a good voice gateway but one that doesn’t break the bank. At the old gig we used Adtran 6355’s and occasionally Adtran 908e’s. Good devices but a bit pricey. Any help would be greatly appreciated.