I hate to say this, as I am a realtor, but unfortunately, realtors do not make a lot of money off of rentals, so they are typically not motivated to go the extra mile when doing a rental. However, you do need an agent for a rental listing, as it is really a shot in the dark trying to rent it yourself. You just do not have the visibility and exposure that you have when you list it in the Multiple Listing System.
That said, I would find an agent who is local, in your area, and when you do hire that agent, make sure that they post the maximum amount of photos (16) in the Multiple Listing System (MLS). It is really awful how may rental listings do not have any photos, not a single one. I do a lot of rentals on the east side of Fort Lauderdale, and I won't even show a rental (or a property listed for sale, for that matter), if there are no photos to show me what condition the unit is in. Even if the unit is not updated, having no photos posted will have agents imagining the worst about the condition of the unit, so always have both interior and exterior photos. Ask your agent to send you the link in the MLS when the condo is listed, so that you can see the photos.
The agent will bring you comparables of what is for rent and what has rented that is comparable, or similar to your unit, to help you set the rental price. I don't know what the rental amount is for your area, but if that amount is $700.00 per month, and you list it at $850.00 per month, your unit will never even get shown. When you say that you "cannot afford to ask below $750 for this unit", again, if the comparables show that anything over $650.00 per month for a unit like yours is too much, then it will most likely not rent at $750.00. Not to sound heartless, but getting $695.00 per month is better than getting nothing per month, so you need to be honest and realistic about your price. Every month that your unit sits empty has you carrying the cost, so be realistic and get it rented. I am not telling you to give it away, but be fair with the price. After all, it is not anyone's fault or problem if you "cannot get below $750.00" and the unit should rent for $650.00: the market will bear what the market will bear.
You can expect an agent to receive a months rent for their service. So if the unit rents out for $700.00, your listing agent and the renters agent who brings the tenant will equally split the $700.00. That brings it to $350.00 per agent side. The broker will take half of that, so now you are down to $175.00 per side. After taxes, gas,, etc., an agent makes almost nothing for a rental, so you can sort of understand why rentals are not an agents top priority. That does not make it right, but it is what it is.
I have found Craigs List to be fantastic for rentals. If your agent does not so this, then you should do it. Get it online to as many sites as possible. Google free rental sites, and a bunch should come up for you to try. Exposure is the name of the game.
Make sure that your condo is immaculate, fix anything that needs to be repaired or repainted, and make it appealing for who ever comes to look at it.
Hope that this helped a litle bit, good luck, Dee.