Does anyone have any recommendations for budget bookshelf speakers to pair with the Fatman iTube. I have been considering the following speakers so far:

Wharfedale Diamond 9.1
Epos Els3
Kef iQ1

Any thoughts?

The specs for the iTube are as follows:

Power- 13W x 2
Freq Resp- 20Hz-20KHz
Signal to noise- greater or equal to 86Db
Input imp.- 100kohm
Output imp- 4ohm-8ohm
Valves- 2x6N1 (ECC85); 1 6E2 (EM87)

Fatman iTube