Hugh, you will no doubt find many configurations among users here on the forum. I have just had to learn as I go and there have been wasted purchases because I "thought it would be good for streaming". I will now run 2 setups, a PC which I built for home games and a laptop for road games and other simple setups.
For our home games (basketball) I use my PC setup because it has 2 Decklink Quads which I need because I am using 6 cameras plus outputting to Hyperdeck Shuttle to record the vmix output for archival.
Laptop Setup (used last night for first time - very pleased)
MSI Computer GT72 DOMINATOR GT72 DOMINATOR-214 $1900 on Amazon
http://amzn.com/B00O4ORZZQThis laptop has 6 USB3 plugs. Great graphics card. 16gb ram
(2) Magewell XI100DUSB-HDMI HDMI to USB 3 capture cards. $199 each.
http://amzn.com/B00I16VQOYI use one CX900 camera and one CX220 camera
Verizon Jetpack Data Device with HighGain antenna attached. Stream at 720p. 2.5mbs
Using same sound system.
www.pcpartpicker.com is the best site for "building" your PC part list and costing it out. I then searched ebay for some used stuff (ie video card or case).
The PC specs are:
Case: Corsair 500R
CPU: i7 5930k
RAM: DDR4 16gb (DDR4 still very high)
Video Card: EVGA GTX 770 SC 4GB with ACX cooling
MB: Asus X97 Deluxe
SDD: (4) 250gb Samsung 840 in RAID 1+0 (total of 500gb space)
HDD: 4TB drive for storage
(2) Decklink Quad Cards (other good brands as well)
(1) Hyperdeck Shuttle for recording
1200 watt power supply
Sound: (the number one overlooked aspect of streaming and IMO the hardest to learn)
Behringer Xenyx 1832USB Mixer ($279 on Amazon)
http://amzn.com/B0036E8DE2ART Pro Audio HeadAmp6 6 Channel Headphone Amp (used on ebay for $135)
Behringer Multicom Pro-XL MDX 4600 CompressoAudio-Technica BPHS1 Broadcast Stereo Headsetr Limiter (used on ebay for $37)
(3) Audio-Technica BPHS1 Broadcast Stereo Headset ($199 on Amazon or $150 on GearTree) GREAT headsets.
I built a small custom rack to hold the mixer, compressor, and headphone amp
Cameras:
(2) Sony HDR CX900. $1500 each and very pleased with them
(4) Sony HDR CX220. $100-200 each on ebay. Good for wide shots. Scoreboard corner overlay, etc. I mount them as fixed cameras to switch to while saving or grabbing an instant replay. Otherwise, always using the CX900 to follow most play action (basketball at the moment)
Logitech C920 webcam to capture commentators.
HDMI to SDI Converters: $45 each and they have worked perfectly for me. I got some on ebay and some on Amz
http://amzn.com/B00ID4BVD0I mounted 2 GoPro's as goal cams but they are a permanent mount and not part of the "portable gear".
Now there are cables, and just the miscenaneous "stuff" we always need (Wireless HDMI transmitter, bulk cable, connectors, spares, etc.) I did not total mine up to the penny but it would be a little less than $12,000. This is with 2 computers. I think you can stream the sports without spending near $2500 on each camera.
Again there are alot of guys here who are much more experienced than me. I am very happy with my current equipment setup and I am now to a point where I will just stream and quit trying to add one more thing to make it better (I think so anyway). You can "one more thing" forever!!
Tim