I just bought the HKTS11 set, (to go with my ONKYO 505E receiver), and I am very impressed.
I bought the full package (+ the stands which do look very nice), but I noticed that Komplett will supply just the front/surround speakers:
http://www.komplett.co.uk/k/kl.aspx?bn=10133
You would still need the center & stands, but this would save you buying the sub.