There are many options for an entry-level CNC. What you consider "entry-level" will be a determining factor. Things to consider before buying... Figure out what size parts you want to cut, then get a bigger machine (you will regret it if you don't). Don't waste your time on belt-driven machines. They will slip, stretch, and break. Stick with ball screws and linear guide rails. Look for one that has plenty of accessories and a good track record of customer support. Decide if you want a "kit" you have to completely put together (like Avid) or one that is pretty much assembled (Next Wave and Axiom).
For the money, Next Wave offers a good variety of options from 12x12 (about $1,700) to 25x50 ($4,999( and everything in between. They are made in USA and are a very good value. They come with Vectric software and usually a monthly promotion to sweeten the pot.
If you want to take that up a notch, Axiom Pro series will not come with the Vectric software but will offer a very beefy machine that will not leave you disappointed. All of the Axiom Pro series fall under 10k. Right now, they are offering a free stand, which will save about $500-600.
I personally started with a Shark and upgraded to an Axiom AR8 Elite. If I had more room, there may be other options I would consider like Avid or Phantom.