The drawback to a Marshall system is the cost. I don't know what the current asking price for the Field Marshall is, but I suspect it may be above your $1,100 budget. I know the Stealth receiver runs well above $1,500 last time I checked.
Nothing against the Marshall, my closest hunting buddy has a Stealth that he's used for years, so I have spent a lot of time around them. But when my Wildlife receiver gave out a couple of years ago I decided to go with a QuickTrack QTR 6000.........and haven't regretted it. Standing side be side tracking the same collar, I haven't been able to tell an appreciable difference between the Stealth receiver's ability to pick up a weak signal and my own QuickTrack.
What sold me on the QuickTrack QTR 6000 besides the lower price, was is its ability to track all collar fequencies in the 216, 217, 218, 219, 220, and 221 ranges. I have collars that my buddy with the Marshall Stealth can't track because it's not among the 150 channels his receiver is programed for. Plus, I don't have to fine tune a collar to get a crisper signal prior to a hunt. Someone I've never hunted with can call me on the radio with a frequency number and I can immediately start tracking their dog.
I believe you can still get a QTR 6000 with a collar for around $900.
Again, nothing against the Marshall or any other tracking system, I don't know that you can go wrong with any of them. I'm just saying that I've sure been happy with my QuickTrack.