If your looking for Home Theater in the future, you may want to forget the tube amp. The tube amp will require a pre-amp unless you buy an intergrated unit. After you buy the turn table and your other DVD/CD/ MP3 source, you will have quite a few bucks wrapped up on your system.
It all depends on how much you want to spend and how you will upgrade. ( What direction will you want to go, Home Theater or 2 channel Hi-Fi )

Many Home Theater systems can sound great in 2 channel. If possible, you may want to visit a near by city and go stereo shopping. Go listen to some Demo's on Home Theater and 2 channel audio, you then go home and think it over. Look up reviews, specs, how much room you have, etc. There are people on this board that will spend days looking at reviews before buying replacement tube for their amps. Take your time spending your money, this hobby can be expensive!

As far as using floor standing speakers in Home Theater. You can choose different options that will mix your bass for large floor standing speaker. Most receiver will have different ways to send bass to your front mains if you choose not to use a sub-woofer.

*** There will be no way ( and no reason to do so ) to sent 2 different inputs to your speakers for stereo and Home Theater. One input from your receiver or amplifier is all you need.

Keep in mind that you can still listen to movies and TV programs in 2 channel audio if you decide to go with the tube amp.