If your gonna 'track' your car (Autocross or car club or whatever...) then coil overs are an absolute must.
If you're only gonna do 'street', then springs are more than good enough.
True, lowered springs will somewhat accelerate the OEM shock's deterioration over time. I'm betting that upgraded, adjustable (compression/rebound) aftermarket shocks will be shortly (6 months...?) available at a reasonable price for the Forte/Koup. Upgraded, aftermarket shocks won't cost any more than the OEM shocks at the dealer and will last 3 times as long...
The 1.3 inch drop of Eibach/H&R's is inconsequential for winter driving in most metro areas; if you can't get thru with lowered springs, odds are you wouldn't have gotten thru with the stock suspension...
So, whatcha gonna do with your ride RCKNROLR? Track or street? You decide. But IMHO, if you stick to street, springs are your best bet for the money.
But then again, that' just my most humble opinion...
Cheers,
******