The RNT position sounds like you will be doing more direct patient care and working on your skills. They may be just nurse aide type skills (basic patient care including feeding, bathing, toileting, skin care, I&O, checking blood sugars) or they may let you do a little more (some facilities allow their techs to insert foleys or start IVs...it just depends on the facility); however, I find any type of job that gives you patient experience prior to graduating from nursing school
is INVALUABLE. I worked as a PCNA (patient care nursing assistant) for awhile and then I landed a job as a NT (nurse tech) at another hospital. Not only did I learn a lot from working both jobs (I worked with a bunch of wonderful nurses who loved to teach!) it gave me the opportunity to work on my skills. As a NT, I could start IV's, draw blood, insert foleys, administer enemas, do dressing changes and perform trach care/suctioning on top of basic duties. I did more of those "skills" working as a NT than I did in nursing school! And working those jobs made me feel more comfortable in a hospital setting and with talking to patients. When I first started nursing school, I was so awkward when it came to communicating with my patients and I was sooooooo shy - a wallflower, if you will - but working as a PCNA/NT prior to my RN really made a difference.
As for the ER registration specialist, that is another good way to get your foot in the door, but it seems like potential employers like actual clinical experience (working as a tech or aide or whatever).
Back to the RNT position...you mentioned 4 nights...are they flexible with that? The two jobs I worked were very flexible - I worked PRN for both of them. The PCNA job was a minimum of 2 shifts/month and the NT job was a minimum of 4 shifts/month with at least 1 weekend shift (friday, saturday or sunday) and we were allowed to come in for 4 or 6 hours, and at "odd" times (there were times where I would come in at 4 or 5pm and work until 11pm because of my school schedule). I made sure that I put school first but at the same time maintained my work commitment. It wasn't that difficult to juggle both. Being a PCNA/NT also meant that I sometimes had to do 1:1's which were nice. Some patients were a handful but others were okay, and that gave me extra time to get some studying/homework done.