Tried tubes and LOVED it, now what?

Second the idea of upgrading parts. MIT Multicap RTX are made of tin and styrene, a very neutral combination. Solen makes a good tin and teflon cap, if you are after a bit of brightness. So does Relcap. Nude Vishay resistors are also worth their weight in audio gold.

I have a modded Sansui 1000a with 7591 output tubes into altec model 19s and the system is quite special. It puts a smile on my face and is non-fatigueing. Best of all it’s got my 16yr old son and all his friends into tubes. I also have a cayin h80 hybrid running my upstairs system. You’ll have to spend quite a bit more money to upgrade. I would concentrate on new speakers first. Welcome to tubes and enjoy the journey!  

The A88T is an excellent amp, especially the MK1 version. I bet you'd have to spend many times that $1K to find something significantly better.

@nasaman, tube rolling is a term used to denote swapping tubes of the same type, equivalent or NOS (new old stock).

For example 6SN7 tube types from different manufacturers: Tung-Sol, RCA, Electro-Harmonix, Sovtek, etc. Ditto with KT-88’s

An equivalent tube type to a 6SN7 would be a 5692 type.

KT-88 equivalent would be 6550.

Experimenting in this way is referred to "tube rolling."

Thanks Lil, I almost thought tube rolling was to hold on top of the tube and swirl them around their feet to get better connection... don’t laugh. 
Thanks all, best $1k I ever spent.