In my experience, the DE razor is only important for a few things.
Angle of blades cutting edge when assembled (adjusted)
Length of handle
There are models that do offer differences although most are subtle. Adjustables allow you to change the angle, some have Slant's, others have teeth instead of a flat leading edge, some are very light and others heavy. It comes down to personal preference. You might find one you like because it looks good and that may be enough to keep you happy with its performance. You might end up going through 3 or 4 until finding one you like.
The blades themselves also require a little trial and error, though that can be done much cheaper with a sampler pack.
The good news is that for 50-70 dollars you can get a quality DE. I would look at a mergress if you need an adjustable, or a fatboy/slim/super off ebay if you don't mind an old Gillette. If you don't want an adjustable there are a lot of models in the 30 dollar range from Merkur, Jagger, Parker and other lesser known brands.