Are you doing reef or FOWLR
? In my opinion and experience a 29 that is not a reef is a waste of time and money, you will quickly want to make it a reef, so plan on that now.
Any skimmer is better than no skimmer. On that size tank you are right on the line for not needing one. I would say if you find a good deal on something, even a Seaclone, just get one. But don't worry about it, and don't get a nano skimmer.
I would say it would be a lot better to have more like 45-60+ pounds of rock. Live rock is 80% of your filtration, especially if you won't be running a skimmer. The good thing is that up to about 80% of it can be dry rock ($2/lb) and will become live eventually as long as the actual live rock you add is very good (not base rock or plain looking fiji).