There is pricing and then there is pricing.
If you need cPanel/WHM for your box, make sure you include that cost as well. Some providers include it with "managed" VPS, but not with the lower cost unmanaged. It can add about $12 to $15 per month to the cost. Same thing if you want off-site daily backups, more than one IP address, etc.
I have two VPS that I lease; one is a fully managed VPS that I have all my customer accounts on, backed up with R1Soft and my own solution. I have cPanel/WHM on that account and it came with two IPs. It runs about $30 a month. A similar unmanaged VPS, with half the memory, is running as a DNS server and backup box, and costs $4 a month. Adding all the services to the unmanaged box makes it about the same.
The unmanaged company makes you click off a little box whenever you submit a support ticket that confirms you have checked their knowledge base, and the solution isn't in there ... if it is, I agree they can charge me $30. They haven't charged me for support yet, but the host with the $30 VPS happily takes any support ticket and responds right away, with no threats of extra costs.