New network layout using 2700 series switches

I am revamping our current network layout.  We will be doubling our existing network to about 75 nodes.  Basically I have centralized all the connections to a single server room.  There are approx 60 workstations (all with static IP), 12 network printers (using print servers on each), and 4 servers.  Three of the servers are function dependant and do not require much bandwidth.  However one server will be used for domain control, i-net gateway, terminal services, and centralized backup.  I am also toying around with housing each user's profile and/or my docs, etc on it.  Therefore I plan to use two NICs on it.  I am new to LAG, but it sounds like this is a good solution.  I currently own 2 2724 switches (both unmanaged).

 

Here is my idea....

Purchase 2 more 2724s, for a total of 4.  These will remain unmanaged and provide connections to each of the workstations and printers.

Then, purchase either a 2716 or 2724 to use as a aggregation point and configure it to managed mode.  Connect a single CAT6 line from each of the 4 unmanaged switches to this managed one.  Then connect each of the servers to it via a sing CAT6.  The high use server will have two NICs, so I will two CAT6 cables and modify the switch for LAG.

Finally, I will use a rack mounted APC SMART UPS 750RM to provide clean backup power to all the switches.

 

I am not a networking expert, just a software engineer.  Does this sound like a logical, sound approach?  Any comments are welcome!