Depends on what you mean by border control, gunfighter. I'm including Customs, ICE, Border Patrol and TSA in that. You could even wrap more people into it. We need them, because I'm not going to pay for a military to spend their time stamping papers on the border and riding around looking for poor Mexicans trying to get across. Not to mention the diplomatic slap in the face that is to Mexico (well, larger slap in the face). If I'm paying for a large military, I want them training and rotating to bases around the world - not babysitting our border. Also, our military can't control the border of Kunar province either.
Onto the other organizations, without the FBI, I'm just going to ask who is supposed to deal with interstate crimes then? The FBI solves so many jurisdiction issues in so many places that would just make make investigations drag on and on.I don't like any of those agencies, especially border control or the FBI. Without the FDA, what regulatory body is going to check against tainted meet? Who is going to investigate cases of epidemic salmonella and has the authority to punish firms? Without the SEC how can we be sure that information isn't being swapped between banks and credit rating agencies to manipulate the market? That LIBOR isn't being fixed? Who are you going to look to the next time swine flu starts to spread around and there's no cure? Or if you're looking to expand your business and export abroad, who is going to put you in touch with the right people and help you navigate the red tape of foreign countries? If there's a run on banks, how can you be sure your money will still be there?
You have to face the facts, gunfighter. These agencies are vital to ensure certain qualities of living and to ensure fair play in the markets. Private watchdogs and quality standards organizations have been historically poor at keeping companies abiding by the rules. Case in point is Rugmark - an organization dedicated to prevent child labor in the manufacturing of rugs. They asked IKEA to join them when IKEA was going through a child labor scandal in the 1990s. IKEA basically told them to piss off, because organizations like Rugmark are traditionally adopted by companies who have the worst reputations in an attempt to spiffy up their image.
As for the states' rights - I agree with the indirect election of senators in the sense that it could reduce corruption. But I disagree with your other reasoning of strengthening states' rights. States' rights was a thing of the antebellum period and has no real place in the modern era.