I posted this recently on another forum, but most applies to your question:
Given your back of the boat requirement, I think that puts you with one of the motor powered steering units. The MK Power drive V2 or MG Wireless. MK has some nice upper-end stuff, but don't think that fits your budget. Both of these seem to have more repair or issues compared to other styles within each mfg. It's probably just because they have more stuff that can go wrong. I have had a MG Wireless 45 for 4 years and no issues, though. I'll run down a quick list of why I choose it over the MK, back then. You would have to check if some are still valid.
- MG came with detachable mount, that was another $35 from MK. I don't leave mine on the boat.
- MG was offering "free keyfob" and that was an additional $ on MK to remove the wired pedal to make it wireless.
- I had experienced no failures with two transom mount MG trolling motors.
- I had spare props from one of these transom trollers that fit the Wireless.
- Deployment and retraction seemed easier than V2 when comparing in store.
- MG has slightly smaller mounting plate.
- You can buy additional mounting plates to use on multiple boats.
Some comments from using the MG Wireless and that may pertain to MK as well:
- Mounting transducers to this style is a little more complicated, and more prone to pinching the cables. I came up up with a rather unique way to deal with this, but recommend getting a model with included ducer. https://www.joefishin.com/TMTDmount.html
- Turning requires frequent checks to see which way the head is pointed. You can spin it 360 until the cord wraps around shaft.
- The MG wireless foot pedal was awkward to use, and it has basicly been in storage. I use two keyfobs, one for each fisherman.
- Keyfob/foot peddle batteries need to be replaced once a season with regular use. Local drug store had them.
- There is no electrical disconnect. I unplug it from power before recharging batteries. This is recommended by MG and there have been reports that chargers have cause failures of control boards.
- Additional, if you run it aground you may need to do a reset. Which is remove power and plug back in. ie you want a disconnect plug.
- Its not that hard to sit on a keyfob and cause some unwanted turning/speed changes.
- These digital controlled motors tend to have more electrical noise, which may require other measures to elliminate from causing issues with FF.
Best deals?: I got mine from Cabelas with a 20% off coupon and free shipping, and no NYS tax. You'd have to shop around.
I am sure I forgot something, but if you have additional questions, I'll try to answer.
Steering: If you mainly bass fish and are always on the front deck, a cable steer is still the best way to go. Faster and requires less visual attention.