Two of us from Slovenia but currently now we are lives in Tel aviv Israel climbed kili via the machame route with a budget operator based in moshi Tanzania named mar tours & safaris(
www.martoursandsafaris.com), They were an excellent tour group - budget trek cost us USD$1122 each including every thing such as two nights accomodation(before and after trek), Picking us from the air port and return. not including tip (we tipped $185pp). They are a locally owned budget style company and i highly recommend them.
On the mountain We had a great guide who spoke perfect English and was very knowledgeable about plant- and wildlife. He was also pro-active which resulted in climbing to the summit during daylight because of strong winds (a lot colder in the night). We climbed from Barafu to Uhuru peak in 5 hours (a group that climbed during the night took 9 hours to the summit).
One thing though, you might as well do the 6 day climb which is really ok if you're reasonably fit, after the Kili song and $TIP presentation, we had to hike out a few more hours. Our porters that passed us on the way down were really happy and saying Hi to us... So, it seemingly went well. Although I can see this going bad if you do not get a good vibe from your lead guide.
Also, by the end, we felt so greatful for their help and hard work, all of us gave away almost everything we had (I gave away my coat, balaclava, gloves, boots...).
Have a great time.