Regarding the original question about advancing to an EMT-I, do not do this unless you can use this with the EMS system you're in and use it well (many Metropolitan cities don't even recognize Is beyond being an Advanced provider to a Basic, but due to the availability of Paramedics don't really get to practice or use their skills due to the Physician Advisor's comfort level, and/or the Paramedics on scene being comfortable, at least here in Colorado).
Also, do not go after this cert for the adcom, only do this if you really, truly have the desire, time, and money (unless you're being sponsored by an agency, which is even better). I completely understand being bored as a Basic, and can sympathize with that feeling as it was something I faced when I went from Basic to Intermediate, and then eventually to Paramedic. Originally, I went to Intermediate because I was in a system that recognized EMT-Is and was allowed to run as one once finished with school and certification. I went to Paramedic to improve my income, experience, skill level for my Hazmat/Disaster team to fill a need that we had at the time, and because Intermediates aren't recognized here for the most part except for in Volunteer systems whose Physician Advisors are comfortable with EMT-Is.
Interesting comments on the I-85, as here it's a grandfathered-in status so to speak and all the programs upgraded to I-99. Also, all I-85s were forced to go to I-99 after a few brief years of the new I-99 curricula. Brief description of skill differences, and at least here EMT-Bs (even with IV) and EMT-Is are very, very different:
Drugs: ACLS drugs, Morphine, NTG, Albuterol, Atrovent, Lasix, D-50 and Glucagon, Reglan, Zofran, and some others including some Benzos.
Skills: Intubation, LMA, Combitube, Defibrillation (Electrical Cardioversion is reserved for the Paramedic level), Needle-D, EJ IVs, 3-lead EKG, and some others
Here's a link for our Rule 500 (basically sets the acts that are permitted without waivers, but leaves it up to the Physician Advisor to choose from the Rule 500 for protocols, etc.). Colorado has been seen as being more liberal than many states for our ALS providers, as a side note to this reference.
www.dora.state.co.us/medical/rules/500.pdf
To the OP, have you considered becoming an ED Tech? ED Tech experience is many times highly advanced, and it gives you the chance to work with several Clinicians to see the differences in various approaches to patients. Also, you probably will not have to advance to the next level of EMS. Good luck with your decision, and feel free to PM me if there's any questions that I can assist you with in advancing between certification levels. 😎