First, congrats on the new home. Nothing wrong with not buying the dream home. My wife and I recently decided to buy a "transition" home rather than our "forever" home. If you think you'll be happy there for 8-10 years that sounds good to me.
That said, I'm still in the "sell" camp for you current place. You definitely should get those rental comps from USCTrojan. $3,200 for a 3-bed condo seems high to me. Sure there's a chance you can get it, but if not you'll have a vacancy and be on the hook for all the monthly costs. Also, while you are positive monthly from an ROI perspective (which includes principal paydown), this property is going to be negative cash flow on a monthly basis, and that's with you assuming a very small 3% cost of maintenance.
My calcs would be as follows:
Rent = $3,200 (subject to confirmation based on comps)
PITIA = $3,500
Maintenance = $160 (5% of rent is lowest I'd use if it's a newer property)
Vacancy = $266 (Assumes 1 month of the year or ~8%. Conservative investors use 10%)
Management = ??? (Is your time worth money? You'll need to source tenants, comply with landlord laws, collect rent, follow-up on late rent, etc.)
Net monthly cash = $3,200 - 3,500 - 160 - 266 = ($726) x 12 = ($8,712) negative cash per year before considering the time investment.
Yes you will have principal paydown which adds another 900 x 12 = $10,800 (non-cash), for a net positive annual return of ~$2k on your $150k equity, or 1.33% ROE. Sure this doesn't account for appreciation, but the housing market has run up since 2010 so I'm not sure you want to bank on a big number there. I don't think we'll see a severe drop, but you do have to account for some risk of values declining. To me, I'd rather put the $150k elsewhere for a higher return with less risk and better liquidity.