Might try a tube preamp

I’ve been toying with the idea of giving tubes a try and thought I would start with a tube preamp running to my SS amp and see how I liked it.    

After reading reviews and looking through some of the posts here on Audiogon I’ve been thinking of a LTA micro ZOTL or rogue audio RP-7 - each around $5k.   Thoughts on these?  

Or would I be better off looking for something else used here on Audiogon?  Maybe a ARC Ref 5 or LS-28?  I’m pretty new to tubes so am open to options.

Thanks