Singer 300W
By "entry level" do you mean novice or inexpensive??
In my opinion after sewing banners in house for years, I would buy the machine you will use and will last forever. Then after this small run it will be easier to sell the next one and the one after that. It may cost more in the beginning but it will make the job much easier. We have a Singer 300W Double Needle Chain Stitch machine. It is a serious workhorse. You can find them used of course. The biggest option for us is the fact that it doesn't use bobbins, it uses 4 big spools, so you're not stopping to change bobbins. We also have a Consew double needle lockstitch machine for back up or special purposes. Our singer has a puller as well. We also had folder attachments made for the hem and another for pole pockets.
Sorry for the long winded message, just want to give you enough information. Good Luck with it!!