it all depends on what you want...I have skunk2's and they are nice and adjustable but stiff as hell...especially with 17's.
My buddies eiboc(forget the spelling at the mement) lower the car and look good and handle well without the harshness...I am buying his when he gets his coilovers for my new teg!
I have eibach sportlines - riding on stock shocks for now... - if you want to spend 400 i say get the sportlines and some new KYB/Koni shocks too - that will be a nice combo and be around 400 maybe a little more. It will ride very nice and look pretty aggressive too!
don't go with the cheep coil overs, they are really bouncy. And you also have to get new shocks with the coil overs.
For around $600 you could get the SRR cup kit which has hight adjustibility and pretty good shoks but if you want to go with springs go with tein spring they lower your car about three inches or H&R they go 21/5" low
Don't go cheap on suspension ever...I did that before I knew more about imports & it cost me down the road. First time I went with racing springs & tokiko non-adjustables. The ride was great for about months, then they got really soft & bouncy. I now run on Ground Control Coil-Overs & Tokiko 5-way Adjustable Struts & they have been awesome.
I wouldn't try and find coilover (sleeves) for 400, most likely end up w/ crap IMO. I'd go for a set of springs and maybe save a little more and get shocks. I haven't priced shocks yet, but for a good price on neuspeed sport springs (1.75 drop front, 1.5 drop rear) go to ARD
Another nice advantage to having Coil-Overs is that if you have to haul anything that is a bit heavy in your lowered Teg, just a few turns on the coil-overs & it will set just fine without the fear of it rubbing
Check this link out. It is straight off Ground Control's website. a set of their coil-overs for a 90-01 integra is $299. They use Eibach springs with those. Check out the picture if you want to see what they look like as well.
Shocks with springs. You can find good deals if you look hard enough. Coilovers will only do you good if you get shocks to match them. Otherwise you'll go bouncing down the road over the littlest bumps. Your factory shocks won't do beans for you. Or just save up a little longer to get some shocks before you buy coilover sleves.