there are a wide variety enlargers available these days at very cheap prices.
I would suggest you think about what formats you will be using, not just now but in the future.
When reviewing used enlargers look for several things that are important:
light tight bellows (if they have them)
is it in alignment
what type of light source are you looking for? a color head can be used for both color and black and white, while a cold light head or condensor head will need additional color filters if you want to print color as well as black and white.
Be sure it has the negative carrier (s) as some off brand enlargers may create problems with finding replacement parts.
Beseler, Omega, Saunders enlarger parts are easy to find .
Because of the available number of enlargers that can be found these days i would op for a professional model rather than a consumer model. They are better built and even if they are old will out last most of us.