Also:
-Maestro: Green Groove
-Dark Void Zero

Are these any good?

Bomberman Blitz - It's freakin Bomberman. If you like it, then you do. Online multiplayer is key here.
Dark Void Zero - It's fun with a retro vibe, but quite short (though the three difficulty levels help) and pretty difficult. Still kicks the shit outta Dark Void for X360

Get X-Scape if you want a good DSiWare game with enough content for your money.

@Crazybrain1: Maestro: Green Groove is pretty cool, but it is not worth the money IMO.
For 5 dollars, you only get 4 short songs to play (You must beat each song 3 times to beat the game and that's it).

As much as I know Dark Void Zero is fun but u can't save the game(?) so it sucks.

Starship Defense, Cave Story, Art Style: PiCTOBiTS, and Dark Void Zero are must-haves.

Have to ask, is there a game that mimics starcraft?

I have enough money in my eShop for a 200 point game, which one do you guys recommend? I was thinking Aura-Aura Climber, since I've always been somewhat interested in it, but then I discovered Pop Island Paperfield, and apparently that's really good as well. Or should I go for something different?

Pop Island is only fun if you have people to play with. I haven't played Aura-Aura Climber, so I can really say anything about it.
Some other 200pt recommendations:
Candle Route, Fishing Resort, 3, 2, 1... Words Up!, Robot Rescue.

Pop Island: Paperfield is, as Morph said, only worth it if you have at least one friend with a DS. If you have the original Pop Island, this is your best choice as it adds 3 bonus tracks as well as the ones on Paperfield.

Aura-Aura Climber ties with Escapee Go for best 200 point game on the DSi shop. Seriously. Go for it.

Or save up 600 points and get X-Scape if you don't have it.

Thanks, just got Aura Aura Climber!

Any decent dsiware games (Uber general, but there you go)

Petit Computer and Puzzler World XL are pretty good.

Or any of the DSiWares recommended in this thread. There's also the "Hidden Gems" thread on the eShop forum.

@Morphtroid
THanks so much for recommending me to save my points for Spirit Hunters. I didn't think it'd come out so soon after you said that. Really appreciated the help.

Oh wow I had forgotten that, it was months ago lol
But you're welcome xD

Here's an incomplete list for you

X-Scape - This is the best game on DSiWare. Get it now fool.
Shantae: Risky's Revenge - I thought it wasn't as great as it could've been but still a load of fun. Many consider this the best DSiWare game.
Mighty Flip Champs - A great, unique puzzle platformer. Best of the Mighty games IMO by far.
X-Scape - Seriously, get it.
Starship Defense - Very lengthy Tower Defense title with a lot of style and a great soundtrack
Flametail - Addictive variant of Snake
X-Scape - Gonna keep repeating this
Glow Artisan - It's good (especially if you're a puzzler fan) with enough extras to last a while, but GODDAMN THIS GAME IS TOO FREAKING HARD
AlphaBounce - I loved this game (brick breaker with RPG elements) but many found it to be a grind.
Aura-Aura Climber/Escapee GO! - Best 200 point games right now
99Bullets - Needs online leaderboards, but otherwise a very unique, enjoyable game (f**k you Yogscast)
X-Scape - Seriously. Go get 8 bucks.

PETIT COMPUTER IS BEAST!!!!!!!!!!!!!!!!!!!1

Which game is better rising board 3d on the 3ds eshop or pop island on dsiware?

One is a single player endless runner and the other is a multiplayer catch the flag game.
If you've got at least another person to play with, then go for Pop Island.
If you're forever alone or don't care about multiplayer, then go for Rising Board 3D.

So, I'm debating between M vs DK Minis March Again, or Pop plus solo.
Which should I choose?

M vs DK is great, but if you've played any others in the series you may not find enough that's new. So I guess it's up to that, but I don't know much about pop plus solo, so ill say nothing about that.