It depends on where in the country you are, as you could visit a couple of shops and get some good ideas.

I live near The BBQ Shop in Woking, Surrey and they're pretty good (they have Napolean & Beefeater). Also Socal in Southampton have a big range too

Going from my own experience I have a Broil King Baron and it's been very good over the last 6 years. It has a side burner and a rotiserie can be used also

I've now got a semi-enclosed space and am considering a pellet grill next time maybe a Traeger? Also maybe a Blackstone??