You'll probably find that the original shocks are gone too, and aren't giving anywhere near the control that they should be giving, so doing springs only may only fix half the issue. You'd also want to be careful that you chose springs that matched the shocks you're likely to buy later as well - whereas if you go for a matched set to start with (Bilstein B8 shocks for instance, with matched H&R springs), you know you're taking care of compression and rebound at the same time.
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