Good tube preamp with Sony 5400


I am looking for a tube preamp for sony5400 running Focal 918s. I set my sights on the Doge 8 and looks like about a 2k investment with tube upgrades.
Is the Doge in the same coversation with the likes of Cary, Joule, or even Mcintosh C220?
I am looking to warm up a bit.
Would an extra $500 to $1000 investment make a big difference?
mcpherson
I have a rebuilt H/K Citation 16a that I will probably hold on to for a while. I am somewhat satisfied to think I am using a Marantz receiver as the pre right now. I am very curious to hear the difference a good preamp should make...