you mention you don't want a stiff ride.. lowered springs greater then 1.5" on a stock shocks gives you a bouncy ride.. your not making sense dude. i'd rather have a "stiffer" ride and be in control of my car, then to have non captive springs and be bouncing out of control around a corner. your better off to pay that little extra, besides your car is detectable with lowered springs that aren't captive and its considered dangerous, where as coil overs are acceptable.
lowered springs will do the job. but like you said.. "it will only last you a certain amount of time".. there is no set time limit and there is always the possibility they will blow straight away. either way i dont see the point in short term fix's.. each to their own, im only giving you my 2c.
and no. if you get a set of lowered springs.. its not guaranteed to find a shock to suit that specific lowered spring, although there are some exceptions.
i dunno how much you research your stuff before you do stuff to your car like lowering it etc.. but a coilover's diameter of the shock is way smaller then the stock shock, when lowering your car the offset and width of the wheels play an important roll in determining weither its going to work or not.. lowered spring may give you that lowered look but did you consider where your wheel is going to end up in relation to the chassis.. just remember springs cant be adjusted and if you chop them then you an idiot.
i dont mean to be rude but look where you ended up with your rims.. your real keen to sell up cos im guessing you didnt consider that type of stuff.
up to you in the end..
all im trying to say is your better off to spend that little extra to save the heart break that you WILL get from the short term fix.
doing it first time correctly is gonna save ou plenty of money in the long run. thats all im gonna say.