Headphone amp as pre amp


Hej

I'm considering to buy a tube pre amp and a tube power amp. Then I realized that my headphone amp, Feliks Audio Elise, has line out and should work as a pre amp. But what are the draw backs compared buying a pre amp?
http://feliksaudio.pl/en/products.php

Any suggestions of tube power amp, with EL84 or EL34 tubes. It has to be a Push-Pull as my speakers ar at 89dB sensibility. And if you have suggestions of a pre amp too I would be grateful.
Budget is aprox $4500 for both.

simna
The same would apply to the Dynaco ST70. Push-Pull EL34's for about 35 wpc make it even more useful! Plus there are newly-manufactured ones with improved circuitry now available! See TAS for a review!
The Dynaco ST70 I have heard of. Problem is, the ones that look good are from US and they don't want to ship to Sweden.
Is there one particiular ST70 to look for or stay away from?
The ST35 is also interesting because I think 15w will be enough since I listening on low volumes.
But the problem is to find one in good shape that I can get shipped to Sweden.
What about these Dynaco Latino ST-70? Any good compared to the the real Dynaco ST-70 Series 3?
I use my Benchmark headphone amp as a pre and use clean out to my Mac 275 tube amp with excellent results 
Using a headphone amp as a line preamp should present no problems and could make the circuit work better anyway. Since the load impedance of the headphone is removed for use as a line stage it’s circuit should then work with lower distortion.
For poweramps, try the classic Music Reference RM-10. It’s a powerful little push pull EL84 poweramp offering around 35w, that should drive 89dB speakers to reasonable levels.