Looks like the OP may have found a good starter enlarger.
These threads come up quite often and almost everyone jumps on the bandwagon for the Beseler 23c probably because that is the one they are used to, but they really aren't very good enlargers. You won't know this until you actually use a really good enlarger like an LPL, Durst, Kienzle, etc. I don't know one serious photographer that still uses a 23c. I know lots of people who used to use one and were happy to move on, after they moved on. Enlargers are pretty cheap, even for the best ones.
Whatever enlarger you get, if you are serious about the quality of the print then get a glass negative carrier and a laser alignment tool.
As far as lenses go, there are a lot of them out there. As a general rule, avoid any lens that isn't 6 elements. Until you can appreciate the difference any run of the mill (my opinion) six element Componon-s, Nikkor, Rodagon etc. will do. If you want to get serious then you should be using an APO lens at least. The best lenses that are reasonably available are the APO Componon-HM and Rodagon-Ns. If you can find a Minolta CE Rokkor-X, a Fujinon-EX or a Computar go with them as they are better than the run of the mill ones but still cost about the same. There are special lenses that are even better but they are difficult to find and very expensive. It isn't worth it for the hobbyist. Most of the people I know who are serious printers use either the APO Componon-HMs or the Apo Rodagon-N lenses for what that is worth.
Randy- The Omegas are better than the Beselers but they have a reputation for not staying in alignment. If you are just getting started though, and get a good deal on one then go for it. It is a hell of a lot better than the 23c. You can always look for a better one later if you decide you need to move up. Or keep an alignment tool handy to check it.
Chris, to answer your question of diffusion vs. condernser- diffusion enlargers are easier to use, especially if you don't like retouching prints. Condenser enlargers are sharper in my experience though. The ultimate sharp enlarging light source for an enlarger is a point light condenser. Durst has one available for your enlarger if you ever want the sharpest prints. You will spend all day retouching them though. Some enlargers have a sort of hybrid system. I have a Saunders 4550xl and the mixing box for 35mm has a condenser in it. It provides better sharpness and shorter exposures but also keeps the retouching down since the light source is so large as a result of the mixing box.
Most importantly of all, if you make good photographs no one else will care about any of the above. Oh so true.
