Is 24 units a decent size apartment complex?

[Toben B.]

I am going to make an offer on a 24 unit apartment complex. I had heard that 40 units was the smallest to consider. That being said I now have 17 units spread across duplexes, houses, and a quadplex.  I will need to use a manager on this one as it is about 45 minutes away and I have a full time job. 

How can I find someone to help me price the apartment complex. My experience with appraisers has led me to trust my own numbers over theirs. However I have never bought more than 4 units so I need a little help on this. 

Thanks in advance!