L1 would be the best bet. Three conditions, it has to be a UK co owning a branch in the States, not a US co with a UK office. You have to work there for at least a year (keep your pay stubs, they are required proof). They have to demonstrate they could not find the talent locally, newspaper ad and a couple interviews...

For investments, I don't know if 1M USD is required, but, I saw in the news some gov or cities considering to use foreign investors to finance local projects and they'll be able to obtain green cards (Tampa Bay Rays new stadium for example) but I don't think they are doing it yet, or maybe it was just more politicians blabbering in the medias...

[update] decide wisely, a visa tied to a company means you can't work anywhere else... You quit, your arse is back on a plane... Which means it is often used to secure cheaper talents that are stuck w the company, of course there are ways (h1B transfer to another company) but they are difficult to achieve...

Good luck!