If I've learned anything, is that I have consistently looked back, and regretted not buying bitcoin when it was lower.
What I've learned is that as much as 1 BTC is out of reach today, the same will be true for 0.01 BTC in five few years.
Weigh both best case and worse case scenarios:
Worst Case: Bitcoin Crashes, and you are out $600.
Best Case: Bitcoin grows, and your $600 will become $2000 - $3000.
If you look back, which would hurt more? The answer is pretty straightforward, so secure BTC today, and forget about it for the next 5 years.