Yes, internships can help a great deal. If you do not get an internship, you may think about getting another degree, particularly for the FBI.
In regards to the FBI's requirements, they just want work experience. It need not be in LE, specifically. With regards to the FBI, a degree in something OTHER than CJ would help and experience in a technical field would also prove to be a huge asset. FYI, I have yet to meet an FBI agent that has a CJ (or CJ-related) degree... and I know a lot of agents.
As already mentioned, an 1811 job in ANY agency is competitive. I think it is less of "what agency do I want" than "what agency will take me." This, by no means, is a meant as a put down... it is just THAT competitive.
Now, as an 1811, you should be less concerned with the entry pay than the journeyman (where you top out). Most 1811s will top out at GS13. Look up the LE paytables for those with LEAP and you will see that it is a pretty penny. The USMS is one of only a few that still max out at GS12. That being said, you'll never catch me complaining. Just ask any FBI or DEA guy when they last recived any OT on their check! LOL I'll make as much as any GS 13 any day, especially with all the SOG missions I go on. ;)
Anywho, any 1811 job will pay great. Get one and then try to find your niche. Once your foot is in the "federal door", to include non-1811 jobs, you will find several benefits. First, often, you stop the "federal clock" of having to get hired by age 37. Also, many times, agencies often open jobs only to current federal employees.
...just a few things to think about.
We bring evil things to evil people, kicking in a door near you!
."In theory, there is no difference between theory and practice. But,
in practice, there is."
- Jan L.A. van de Snepscheut
"The difference between 'involvement' and 'commitment' is like
an eggs-and-ham breakfast: the chicken was 'involved' - the pig
was'committed'."
-unknown
Working on a PhD in CQB one doorway at a time.
When the wolf attacks, he will find not all who run with the flock are sheep!