The 4330 is pretty easy to match and works well with most speakers but it really is worth persevering to get the absolute best out of it.
The Epos suggestions are excellent if you can find them on budget, but I'll add a few thoughts based on speakers I've tried with my 4330R.
Mordaunt-Shorts are a great match. If you really want to keep the budget tight, seek out a pair of MS20i Pearls. Excellent, incisive but musically engaging speakers, available in good condition for around the £50-£60 mark these days. The more recent Avant 902is work quite well, but they aren't as natural sounding as the Pearls so out of the two I'd stick with the older design. The Avants are a little OTT at the frequency extremes - something MS really sorted out with the current Aviano range. The Aviano range works really well and I love the way my Aviano 2s sound with the Creek - plenty of detail, lots of control, really impressive bass depth but also a great sense of atmosphere and spot-on soundstaging. Good rhythmically too. If these are a little large for you, the Aviano 1XRs would be well worth a try and give a slightly faster sound, though with some loss of warmth. Both Aviano designs are very fluid and engaging sounding, with a naturalness of presentation (particularly in the bigger speakers) that is very appealing.
Mission 751s work superbly with the Creek, particularly if you want the sound to major on detail, openness and pace, rhythm and timing. You should be able to pick up a clean pair for well within your budget and their very rigid construction helps them to create a great sense of atmosphere too.
If you prefer a softer edged sound but with very tangible soundstaging and a fluid mid-range, try to find a pair of the original Quad 11Ls. The Creek has a great ability to get the best out of these speakers and produce a relatively rich sound with plenty of strength. There is a slight lack of clarity at the frequency extremes though, which can get a little irritating.
New at £130, the Tannoy Mercury V1s make an interesting partnership with the Creek. You get a very fast, energetic sound and if you like the impressive school of hi-fi it might fit the bill. However, longer listening sessions can get tiring and the V1s, great budget boxes though they are, don't really get the best out of the amp.
Hope this helps a little! Enjoy the amp. Its a superb design.