The best $400 subs are the RSL Speedwoofer- 30 day trial, shipping both ways included, and the HSU VTF1 Mk3 (which is $449 with shipping, you pay return shipping if not happy).\n\nIf you watch a lot of action\/sci-fi or other movies with a lot of bass IMO you would be better off with a good sub than a center channel. You can get by pretty well with most content using a phantom center (2.1). The speedwoofer is also wireless ready.\nThanks im going to try to save and get this one seems from what ive read its a good one. Plus the wife says its ok, so ill sell my saw for aroung 500 that will take care of it. Or maybe my lord of the rings ranger sword, last time i sold one for 450wh\nFirst, be happy that you now have a pretty nice sounding system. I suspect the change of speakers is by far the most significant improvement you will see. A good sub or center will likely improve the sound, but by a lesser extent.\nI would say the decision between sub vs center would mainly be dictated by your application.\nHow much music vs Home Theater do you intend this system for?\nI am probably 75\/25 music vs TV, but when I eliminate TV shows that don't have real attention to sound (like the news or comedy shows like Jimmy Fallon - where your 280's are more than adequate) I am more like 95%\/5% music\/HT!\nAlmost all music is recorded in stereo and you are best off not using any of the synthesized multichannel features of your AVR! Thus, for someone like me (95%\/5%), a center speaker offers very little, since it adds nothing to music. A sub, on the other hand will round out the bottom end of my stereo music, so is much more important to me.\nI should add that there are some good music recordings made in 5.1 (or other multi-channel formats). Some of them are quite well done by people who really embraced the technology, but by and large, they are novelties - I say that because of their rarity and extra cost - I don't intend to discount the effort some groups have invested to produce a quality 5.1 recording. Others simply use the extra channels mainly for ambient effects, and then there are a few that should not have attempted 5.1 without more forethought!\nIf you listen to lots of TV and movies, then the center may be of greater worth (although many would still suggest the sub as more relevant). Just listen to your system as it currently is, how well is the center image maintained (without the center speaker)? Close your eyes and image a center speaker, is a fair amount of sound coming from this Phantom center? Some speakers do this better than other and I suspect the 280's do it well. Do you have difficulty hearing dialog with your 280's? If so a center may be very worthwhile for you since you can raise the volume specifically on the center which almost always carries the majority of the dialog!\nI went 5-6 years without a center, even as I went from 2.2 to 4.2 (surround without a center). I finally added a center and really don't feel it made a big difference in my sound. But for others, adding a center was a major improvement, so check the above aspects with your current speakers to get a feel for what you might gain!\nOk so i went to the home depot an bought some rubber mat an cut it to the size of the base of the 280s the house we live in sets off the ground with hard wood floors, after i did the rubber mat thing, the bass now makes the floor shake when turned up. Which it didnt do before.So dont think i need a sub now or for that matter a center, watching tv it sounds like there is a center. I started a new tread and i think my money would be better spent on a better receiver like an onkyo 777 more watts an i could bi amp my speakers. Plus it has more features so in the future i could do atmos or just leave it alone , and enjoy it. i think that would be money better spent. A reconditioned 777 with one year warranty is only 299 dollars so im going to do that. I want to thank all of you for helping, thank you very much.