ZCash mining is a great way to get started in cryptocurrency. ZCash (ZEC) is one of the top tier coins. ZCash has substantial value now and is poised to continue to grow. You can check out the ZCash project in the Coin Database here (link to coin database)
The Nvidia GTX 1070 is a great GPU for mining ZCash. I am running a rig with 6 GTX 1070 GPUs and average about 410 sol per card at 100 watts of power. At this time, at GTX 1070 runs around $400. You can get one here: ZOTAC GeForce GTX 1070 Mini 8GB GDDR5 VR Ready Super Compact Gaming Graphics Card (ZT-P10700G-10M)
If you are looking for something more reasonably priced, you can buy the Nvidia GTX 1060, which produced about 285 sol per card at 100 watts of power. While this is less than the GTX 1070, the cost of the card is about $200. You can get one here: EVGA GeForce GTX 1060 3GB GAMING, ACX 2.0 (Single Fan), 3GB GDDR5, DX12 OSD Support (PXOC) Graphics Cards 03G-P4-6160-KR
The GPU is the what does all the work, but you will need the rest of the system. You can use your existing system with a power supply that can run two GPUs. The great thing about the Nvidia line is that performance tuning is very easy and Nvidia cards mine with very low power. A 500-watt power supply is plenty to run a computer with two Nvidia cards for mining. I got started in mining by putting two Nvidia GTX 1070 cards in my existing computer.
If you want to go all in and build a rig, you will need all the components required to build a computer. This include a main board, a CPU, memory, a power supply, and an SSD drive. You will also need riser cards to get more than 2 GPUs to work with your rig. I have built three mining rigs with the ASUS Z270p board and have found them to be rock solid using 6-8 GPUs with both Linux and Windows. Here are the links to all the products you will need to build your rig:
PCIe Riser Cards: VICTONY 6-Pack PCI-E Riser 1x to 16x Powered Riser Adapter Card w/ 60cm USB 3.0 Extension Cable & MOLEX to SATA Power Cable-GPU Riser Adapter-Ethereum Mining ETH+MintCell 6 Cable Ties(02)
Once you have the equipment, you’ll need to build or buy a frame. You can buy a frame like this one: Aluminum Stackable Mining Case Rig Open Air Frame For ETH/ETC/ ZCash (Black) or you can build one out of simple lumber from a major home store.
After you have all the gear and have installed it in a rig, you’ll need to install an operating system and mining software. For an Nvidia rig, I suggest Linux. You can download this for free or go with a packaged solution like www.getpimp.org. I have done both and while the PIMP solution is nice, it’s not much harder to do it for free if you are comfortable with Linux or even just following any of the many wonderful install guides out there.