Save your gift card and credit until you NEED it. If you amass a collection of low end basses, you'll have...a collection of low end basses. My friend called it "Artist poverty mentality," meaning artists constantly justify cheap tools saying it's 99% of the way there for 1/10th the price, etc.
I just sold everything I had, including some decent basses, and a few low end ones, and got a very nice bass. It was used on tb, not super super expensive but more than I've spent on an instrument before, and fits me perfectly.
Now I see what a great instrument really is. When I play the lone remaining low end bass here, that I can't sell because it's not really mine (long story that's not interesting), it's not terrible, but it's not great either. I did gigs on it and it worked ok. But the new bass (birdsong) is incredible in feel, fit, finish, and sound. And will fit every gig i do, hopefully for the rest of my life. The only reason is get another bass now is if a killer paying gig absolutely required it. Since that's yet to happen in my life, I'm not worried about having "options."
I wish it didn't take me until 40 to learn this. I sound old and parent-like now, huh?
If your dean plays on tune and doesn't make extraneous noises, play it while you save for what you really want, whatever it is. When you know tons of songs and are cool to work with, nobody paying you will care what kind if bass you play. And they probably won't care too much what it sounds like unless it makes noise that it's not supposed to. And if you're that valuable to them as a player and they don't like the sound, they may even buy you the instrument that they want you to have. It's happened! Not to me, but it's happened...
I know a guy who was subbing for the Spider-Man musical when it was running on broadway, and that bass chair requires 5 different basses- all of which were provided and were required to play. And there are other situations like that too. Not just broadway either, someone else I work with tours with a well known metal act and he got a deal (or may have been free, I didn't really ask) on instruments that were needed for the gig.
Anyway, good luck with whatever you decide, if you're like me you'll disregard everything I just said and then post the same advice to someone else in about 20 years! ;-)
Best of luck and cool of your dad to support your music no matter what