My first question would be why do you want to go to the US as this is a more important question for figuring out an appropriate strategy.
IMHO, honestly there's not much point in going to the US these days. You can get superior access to capital in China, superior access to far cheaper western education in Australia, New Zealand or Europe, and equivalent earning potential jobs in Australia, Hong Kong, Singapore, and the UK.
(source: http://www.itworld.com/article/2947616/careers/developers-ma...)
It is tied to NAFTA though and in the current climate this may not last.
That said, work where you feel is best for you, given your capabilities.
You are supposed to come over, invest your money, then leave the country and wait for a decision (?!). However you can come over on a B-1 (business) visa and change status to an E-2, but then you're landlocked and unable to leave the US without losing your status and having to re-apply.
You have to renew every 3-5 years (again the duration is discretionary) and if you're denied you have a matter of days to sell up and get out.
There is NO route to a green card or citizenship. You are a non-immigrant alien. Every 3-5 years you have to hope you get renewed. You can be here for decades and if your renewal doesn't go through, out you go.
The E-2 is a very poor visa program to come in on if you plan to build a life here. If you don't really, really want to 1) invest everything you have in a business and 2) do it in the US and 3) leave again once you're done, it's not ideal.
Alternative routes I'd recommend looking into as a single individual with tech experience are:
1) Get a job with a US company who will sponsor your visa to come over on an H1-B, or, if you're a published expert in your field, an O-1. You don't have to be as famous/expert as you think - I have friends on O visas who are Senior tech people who have a few conference talks and published articles under their belt who have qualified. Both have a route to green card/permanent residency.
2) Get a job with a multinational company who can transfer you under the above visas. With companies look for larger orgs with in-house counsel who regularly handle immigration matters. Small companies are not well equipped to handle sponsorship and the delays/expenses may cause them to get cold feet at inconvenient times.
3) Fall in love with a nice American and get married.
Feel free to PM me if you have any questions! Happy to share my experience. (Above isn't legal advice and is based on my own experience so may be wrong - talk to a US immigration attorney with E-2 experience if you are serious!)
I don't think the savings are enough, but it depends on the type of business/where you will be located. If that is the extent of your savings you have to consider living expenses/relocation in addition to the amount you will put into the business as an investment.
I would also look into consulting with a laywer that has experience in this field.