If you are looking at dedicated servers, I am assuming you are looking at a much neater version than the ones mentioned above. Hoping that you have a good idea about your requirements beforehand.
A good dedi server will cater to strong traffic of at least 200K users per month with security and DDoS protection. I deployed the same for one of my colleagues, thanks to ResellerClub. Their servers are awesome. No downtime. Storage, Bandwidth are fantastic and most importantly, cPanel, WHM for you to manage the servers. Also, as you scale, prices don't change drastically.. you can check their website and understand more.