You can simply make up 18mm spacers for those kicks I believe. That will allow you to mount 6.5" drivers up front.
However, brands I would recommend adding to your audition list for your budget include:
Treo
Oz Audio
Digital Designs
Boston
Phoenix Gold
Diamond
DynAudio
Hertz
Focal
Crossfire
Morel
Vibe
Phass
Eton
Lotus
Let your ears do the decision making. Remember the key is too listen to as many products as you can and let your own ears decide for you. There is no special scientific formula behind the choice. Just go with what you like the sound of. Please don't just take our word for it Other audiophiles may well have totally different tastes. Check the products out yourself and see if you remain with the afore mentioned ones or you settle on something else.