As others have said, for $5,000 you are not going to get 100TH/s without a huge electricity bill, unless you have free power, but you may have a lot of questions to answer depending on where you are located.
I've been playing around with various miners for a while now, going way back to mining Litecoin with CPU and crappy GPUs beginning in late 2011/early 2012.
I've been piecing into my current multi-currency mining farm over the last 7 months or so and have:
My next equipment purchase is likely to be a couple of
Canaan Avalon A721 miners. These miners will be part of a group buy and hosted in Canada. These miners get ~6TH/s and use 900 watts of power.
If I had $5,000 to spend now, I'd probably go for 4 or 5 (depends on the group buy price) Canaan Avalon A721s plus one controller in the group buy, and pay to rent the power supplies. I'd also then start rolling the profits back into purchasing more Avalons until the Next Big Thing™ rolls around. Another viable possibility is to buy
4 or 5 GPU rigs (depends on prices of GPUs) and mine either ETH or ZEC.
Even though they have higher hash rates and are more efficient from a GH/watt perspective I'm avoiding the Bitmain S9 miners based on the reported build quality/reliability issues and the challenges of having warranty repairs made. If Bitmain cleans up their manufacturing and addresses the reliability/warranty repair concerns, I'll consider buying from them.
Additionally I will be purchasing some of the
new GekkoScience devices when they become available.
Cheers,
- zed