Sounds like you'd do well in a cardiac medicine or cardiac surgical floor. My advice would be to start talking to the NM's of those floors, set up a day to shadow one of their nurses. Be sure to soak it all in and ask pertinent questions. Remember although you are just shadowing, leaving a good impression on a staff member can influence them to give their opinion of you to the NM. Believe me, just had someone shadow me and after that exp, I went straight to the director and told them we had to hire her. When I think of people who would do well on our floor (CT-ICU), i'm looking for people who are inquisitive, ask questions, learn quickly, and come from a good solid nursing background. From what you posted, it sounds like you really know what you want. So just be honest, but don't be overconfident.
Other things you can look into would be PA caths & hemodynamics, vasoactive gtts, typical patient population of the units you are looking at, mech ventilation. We don't expect you to know everything, but if you have a good idea about how we use these things, it might give them the impression that you are ready and willing to learn what they teach you. Also, if you haven't started precepting, you might consider that... or being involved in committees. Both only help distinguish you as a person who goes above and beyond, and will only strengthen your application.