Well, it depends on where you're playing. If you just want a casual deck then what you have is probably okay. If you want to do things like gamedays and FNM, then you probably want something a little more competitive, like the BR zombie decks out there. They run a fair amount of black, but the red in them is important for various reasons.
Mono color right now isn't a good idea (assuming you aren't heavily budget restricted) just because the best cards are often in multiple colors. 2-3 and sometimes even 4 color decks are the norm in the current format. Sticking with one color really limits your card selection.
Below is one example of a B/R "zombie" deck.
http://magic.tcgplayer.com/db/deck.asp?deck_id=1112290
It includes a lot of strong black cards, vampire nighthawk, geralf's messenger, gravecrawler.
There's also potential for a BG zombie deck, using cards like lotleth troll, blood scrivener and varolz. I'm working on building something in that vein, but I'm not sure how competitive it will be.
JUND is a strong combination, that's Black Green Red, but the mana base will set you back quite a bit, you'd need the pain lands and tap lands to be able to consistently cast your spells. If you google jund aggro or go to starcity games and look at the standard tournament deck lists you'll get a good look at what works. And like I tell most newer players, the guys that go to and win those tournaments are some of the best players around and you'd be hard pressed to build a deck that's better than theirs when you're just starting out. Chances are someone has already thought of the deck.