Monte,
I own Logitech X-240's, X-620's, Z-2300's, and Z-5300e's. My friend owns the Z4, and strictly between the Logitech products I'd recommend the 2300's over the Z4 but in consideration of your apartment space the Z4s are just as loud and don't take up so much room. The tweeters take up more vertical space than the 2300's which are wider, and the sub is smaller on the Z4 too so you'll save space that way.
Second, although I own 2300's it was purely because i got them for cheap (I already had 5300e's). You can listen to Logitech going on and on about THX certification and all that but in a small room the definition is going to be close if not negligible between two subwoofers like those two. However, the wattage is definitely much better on the 2300's so if you like electronica (high 5) those would be a better choice especially if pricing is close between the models.
The only other thing you proabbly have to consider between the Z4 and Z-2300 is price. I live in Canada and here the 2300's retail for $220 but when they're on sale it's $120 (for some reason, it's just like that). The Z-4's NEVER go on sale here and are normally about $90-110. I'm not sure about where you live but that's the pricing here. If you can get them for a good price, the 2300's would be the better buy. Hope that helps!
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