I prefer speakers with the crossover on board, just because running another set of wires to the door isn't my idea of fun (but really, it's not hard either, just rather use what's there)....you could also cheat and put the crossovers on doublesided tape in the door...there is a lot of room in there, just keep clear of the mechanicals...
For simple drop in and good quality, I'm partial to Boston Acoustics, S85s are a direct drop in fit....SL80's are nice but technically don't fit *EXACTLY* one screw hole doesn't line up, so drill another one, or be happy with 3 screws holding it (the door panel goes back on over it anyway, no chance of it ever falling out anyway.) I documented my SL80 and continuing install
HERE if it helps, lots o pictures.....
S85's are $70-75 or so new on ebay...SL80's used go for around $80-120 (170 new)
As for kick panels....depending on the year (ESP late model) none are available...and as said before, that's where you feet go....unless your really into the audio scene and the intrusion is worth it to you, I'd avoid kickpanels...they get in your way and the speakers end up getting...ummmm......kicked....in daily use.