Question about redundant NW design

Guys,
I have 9 L2 2960x flexstack and one L3 3560. I'M curious how i would design this network with as much redundancy as i can ?
Lest say i have 8 Vlans ,I figure setting 2/3 ports ether-channel/vlan trunk from L3 to first L2 switch in stack. Then for redundancy god for bid any one of my switches went bad or even flex cable ,setup another ether-channel for each switch back to the l3 switch or just connect cable without ether-channel and let STP do it's job, should be in blocking mode until other link dies ?
My real serious question is my I only have one L3 switch , so if that goes I'm screwed, so if i bought another L3 switch one how would i make it redundant for the other access switches to the net?, do i need hsrp/vrrp because on i only have ip base (SMI) not EMI, so that would not work, plus the isp router only has one connecting? Any hep would be great ,thanks guys
SO HERE MY SETUP I'm looking to design..
NET <----isp router----->L3intervlan------>9 L2 flex stack 8 switches

If your 2960-S stacks contain the full 4 stack members and you plan to present a pair of 3560 EtherChannel uplinks to each stack, then Cisco recommend you terminate your two EtherChannel links on stack members 2 and 4. There is some logic to this, but see the following for details (figure 9): -
http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps6406/white_paper_c11-578928.html
If you stick to a single core/distribution layer switch and use EtherChannel, then you won't need Spanning Tree to actively block an any uplinks between the core and access layer stacks. Instead, EtherChannel can load balance across all uplinks.
Yes, you are 'screwed' if the 3560 or ISP router fails. Shame you haven't got a 3750 instead of the 3560, because you could then buy another 3750 and stack them. There are pro's and con's to stacking a pair of 3750s verses a pair of 3560s though.
If you buy another core/distribution layer 3560, then you would need to rely on Spanning Tree to actively block the redundant uplink to each 2960-S acces switch stack. This is because you cannot run EtherChannel load balancing between both 3560s and each stack. EtherChannel will only work between each individual 3560 and each stack (a pair of 3750s would get around this limitation though).
Reference connectivity between a pair of core 3560s and your ISP router, HSRP would be nice and simple, but if not available, then you could implement layer-3 routed links. Either way, the ISP router would need two LAN interfaces, one connected to each 3560. You'll also need a direct link between the two 3560s.
If using routed links, then you'll need to establish routing between all three devices. This can be done with an IGP, such as OSFP, or static routing.
Any plans to add a second ISP link for redundancy? What's the primary circuit link type?
Where's your firewall?
Hope that helps. Let me know if anything is unclear.

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