Roth is great.  It makes a big difference over time.

If you put $4000 in it now, assuming 10% return, in 30 years, you'll have $69,798.   Without the Roth tax savings on capital gain, assuming 15% tax rate (LT cap gain) and annual turnover, you'll have $46,233.

Now If you put $4000 in it every year, you'll have $660,000 in 30 years (same assumption as above).   Without the Roth tax savings, you'll have $500,000.

Once your income is over a certain threshold, you won't be able to contribute to Roth any more.  So enjoy while you can.