On point 2, futher on the DataSheet:
If your on a tight budget, checkout the SRX240 Service Gateway, but its going to be a bottleneck point say when you want upgrade in terms of mixed service throughput. If your budget allows a little more, you should probably go for SRX550 Service Gateway or SRX650 Service Gateway.
Contact your local Juniper Network Sales Office for Demo Units, Cost to Deploy details & Discounts as well 🙂