Interventional Radiology is so dynamic and interesting, a great combination of hands-on direct patient care and technology, IMO.
My strong advice, though, is to get at least
one year of Critical Care experience.
You will learn SO much more in that year, adding to what you say is already 'a really solid foundation.'
The more you learn, the more you will realize you don't know, if that makes any sense.
In Radiology you will work with a lot more autonomy.
Working in a Critical Care area will help you develop that combination of organization, experience, techinical skills, assessment and just plain intuition -- gut feeling, if you will -- to function well in Radiology.
The four Radiology or Cath Labs I've worked in would not hire anyone without at least that year (sometimes two or three were required) of Critical Care or ED or PACU experience.
Good luck to you!