I had to choose the 1048 or L20 (able to get at the same price), and chose the 1048 for its quietness. I do have it running submerged in a reservoir withrubber bands around it, but the thing is dea silent unless your stick something loosely to the reservoir to make it slightly rattle. If youre aiming to get it inside your case, you might have to be creative if you dont have a big case. For comparison purposes, with the front cover thing removed its about as long as a 92mm fan, as tall as an 80mm, and as wide as a 70mm.
I really dont like the barbs that come with it, they are way too short with just a single edge that is placed around the middle of the barb shaft. Basically, with my thick & heavy Home Depot 1/2"id-3/4"od vinyl tubing, it was leaking even with hose clamps as tight as they would go. It was an easy fix though, just get a 1/4"NPTx1/2" threaded barb, and itll fit in nice and tight.
If you really want a 12v pump for your budget, others are starting to get their new Mags, and Cathar said hed do a comparison review of the Mag, DDC, & D5 today
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Finally, sorry to break your bubble, but your total project could very easily go above $100. I'm not saying that because Im jealous (my system will be finished today or tomorrow, for around $80), I'm just saying that protecting your hardware by buying enough hose clamps, and actually using a T-line (or your own reservoir), and getting better quality tubing than Home Depot vinyl sutff, will save you a ton of headaches and stress once you get everything up and running. Yes, I'm saying all of those things from experience.