I can't think of a single business that Apple could buy (note: could buy, not 'look at the market cap and assume that is what it costs to buy the company') that would give it a level of control in an industry that the government would care about.
http://www.hnsearch.com/search#request/all&q=brudgers+di...
Disney would actually brighten Apple's halo, they have a devoted customer base which would accept the merger, and produce the most salable content in the world.
Why take a risk on the downside of creating content when you can charge a 30% toll across all of it? Also a different type of business and model. It would also leave them in conflict with the other media companies.
What I could see is buying Netflix, but Apple would be in a better position to just build that from scratch with better terms (again, the toll for accessing the Apple ecosystem/platform/whatever-you-want-to-call-it).
The other one is Akamai - Apple has been a long-term customer (probably one of the largest), they are delivering a lot of content (and ever increasing) but don't have any real hardcore infrastructure in the way Google and Microsoft do.
Purchasing Disney isn't primarily driven by the fact that they are a movie studio. The purchase makes sense because of Disney's existing media portfolio and the worldwide demographic which their properties attract.
Apple could buy any one of them, either through friendly or hostile means. Not a single one of those would make it through anti-trust. Shareholders for Cisco would love to get $200 billion for their company; the US Government would never allow it in a million years. Shareholders for Amazon would love to get $200 billion, and they'd likely outvote Bezos' family holdings to agree to the purchase. Larry Ellison would sell Oracle for $300 billion in a heartbeat, and all shareholders would agree. Intel shareholders would instantly take a $300 billion bid; the US Government would never allow that purchase either. Apple also would never be allowed to gobble up either of the telecom monsters; AT&T shareholders would take a cash + $250 billion in shares deal, and Verizon shareholders would easily sign off on a $200 billion deal.
I think Apple would love to own their own telecom network, given their love of all things integrated. The things they could probably do in owning something like Verizon's network would be astounding. It would never be allowed.
Applying that test to all of those companies doesn't give Apple supplier control, extensive pricing control or monopoly power in any market.
for eg. even acquiring HP would be total 'PC' market share of ~25%. The only one that may be a concern is ARM, but that doesn't mean mergers are stopped, it just means that agreements are reached (for eg. as with Google and ITAR)