The Tannoys are in a different league to the Denon speakers and are, IMO, by far the best speakers in their price point. It might be worth you also auditioning the Onkyo CS525 with the Tannoys. Its a belting little system. The Teac Reference 300MkIII CD player and amp also make an excellent (and fuller, warmer sounding) partnership with the F1s.
If you wanted a warmer sounding speaker with the Denon, try the Cambridge Audio S30s. Just don't position them in corners because they can get boomy. Excellent speakers though.