my friend in japan says he can get s15 injectors for around 150 shipped.
also if you wanna go budget you can go 3rd gen RX7 injectors but you have to find 2 sets of them since primarys are 550's and secondarys are 720 or 740's im havin a brain fart. i found a write up on how to do FD injectors in an SR20 but its on my computer at home and im at my sisters.
the only problem with the top feed injectors is you have to get a FPR too so add that on to the 430. but the good part about the top feed is if you wanna upgrade they are so much cheaper then side feed.