I would recommend Storm Server from StormOnDemand.Com.
You can get their entry level storm server for $35/month. Scaling up is as easy as a few clicks of a button.
If you like to get cPanel/WHM on it and a fully managed one, that would add an additional $20/month. But I think it's worth it.
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What do you get in terms of traffic (eg. Monthly visits, daily visits, etc..)?
What is your max concurrent users?
Would you mind sharing a link to your site?
Actually, my website is brand new and I will be changing the subject of it on the new host. I'd rather not mention it here.. but what I really do need is a very good host who does regular back ups... I am looking for a permanent solution...
I suppose it doesn't have to be XenForo specialist but must be a permanently good solution.
If you need a fully managed solution I would say try SingleHop despite the fact they are a bit on the expensive side but I can't directly speak to any experience with them because I haven't used them. All I can say though is I have hard and seen good things about them.