Online with BHFtime's comment…
If you can't afford and expensive set. I'd personally go with a quality ratchet first and foremost. That is the most important IMO. I'm a big fan of my long, flex head, comfort grip Snap-on 1/4 ratchet, but I'm sure their are other quality brands and styles of 1/4 ratchets.
I'd like to say go with a quality extension set too, but you can only spend what you can afford. I'd try to get knurled extensions. It makes life so much nicer when you have oily hands/fingers.
Sockets are what usually get lost so if you go with a cheap set, then it won't be so much of a loss when one does disappear. I personally prefer sockets that have a stop. Other wise greasy nuts have to be fished out of the socket.
I guess it's my OCD, but I don't like buying all these "Old Style", or "discontinued" sets. When I end up breaking one later on and know I will never be able to get a exact replacement, it ruins the whole set for me.
Guess this all depends on the use. Is this a home set and something you plan on having forever? Is this just a get by set until you can afford nicer? Do you turn bolts daily?
Their are a lot of factors to consider depending on your use and needs.