Location is up to you, both will work but its best to choose a location closest to your main target audience/visitors... If the band is in the US go with US hosting but if the band is a UK band then go with UK hosting.
None of our servers are "jam-packed" as we do not oversell, but reseller accounts are mostly designed for many small sites or a handfull of larger websites, so if you know for a fact that your one site needs a lot of CPU then we recommend dedicated hosting every time. We would hate for you to signup for reseller service and find the site is suspended due to using too many resources one day. Its best to choose the right platform now and save hassles later down the line.
Yes our servers include full dns all setup and ready to go for you, so you would just point each domain to the nameservers we provide, and then dns is handled by your control panel on the server.
Yes our servers include a "reseller" control panel so you can sell hosting to other sites and also sell reseller accounts to your own clients.
With a dedicated server we can setup shoutcast for you yes. With reseller accounts this is not possible, but with your own dedicated server it is yes, and on the same server that hosts the websites.
Our servers are "fully" managed so we do provide the server totally secured, online and with all software and services ready to go. We also monitor and manage your server 24x7 to ensure it is always online and responding as expected, if you had a problem we email we would fix it (probably before you even noticed). Our server management is the most comprehensive available and it sounds from your last experience that this is exactly what you need
For a quote you will need to contact our sales team, personally I would recommend our bronze dedicated server shown on the website, if the budget will stretch that far as its a super configuration (much higher spec to most high spec offers elsewhere) so its a great server to be based on especially if you need a lot of CPU resources AND plan to run shoutcast off the same server...