Networking Configuration – Recommended Layout

Tags:
Network Configuration
Networking
Hello,
Drawing on the networking expertise here at hand, I'd like to ask people with experience if the following configuration is a suitable way of doing things. Most of the bottom is currently in play, just need a little guidance on reconfiguring switches for best throughput/config.
General: Gigaworks Shielded Cat6, Shielded Keystones, Shielded Patch Panels, ~ 100 Computers & ~40 IP Phones on site.
Server Room =

3 x HP 1820-48G Switch

1 x HP 1820-48G PoE Switch

2 x Synology Rackstation

1 x Digium Switchvox 310 (Telephony)

Area on premises at 75m Cat6 distance =

1 x HP 1820-48G PoE Switch
Network will be used for high speed access to a couple of racked NAS, both linked via a 4-port trunk each. Also for internal VoIP and access to external line via Switchvox system.
Now my first instinct on connectivity is to use one HP 1820 as the main DHCP, and connect every switch to it in a star fashion via a 4/6/8 port trunk. Also connect the two NAS to it, as well as telephony. QUESTION: Is this the best way to do things or is a daisychain more appropriate?
Also seeing as the switch at a 75m distance is within range, trunk that also via 4/6/8 ports. QUESTION: Is shielded Cat6 suitable for this 75m distance (could possible be 80m but no more) or would we be better off using the 4 SFP ports on the central switch and connecting the two via SFP and fibre?
We want to ensure there is plenty of bandwidth, so want to use the maximum trunk members, but we are unsure whether an 8-member trunk to every switch from the main switch is excessive. What are your experiences? As for traffic, out of the 100 computers only ten to 20 will be reading/writing data heavily at any given moment. Half of the machines are SSD powered and are capable of saturating GigE. File sizes can be a few GB or so. 15 - 20 machines will be updating their 'Time Machine' on the fly onto the NAS. And of course the VoIP burden, several concurrent calls at any given time.
Last Question: Is the HP 1820 a good switch model to use within it's price point or do you have any other recommendations that could be vastly more capable or a better bang for buck (1820-48G non PoE ~ £300, PoE ~ £600).
Many thanks for your help.
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