I think you would be better served if you rented for your trip. Then you will have a better understanding what you might need at home. I would rent especially if you don't plan on using them on your home waters.
There are three basic types of waders, Hip Boot. Waist High and Chest High Waders.
1. Hip Boots
Hip Boots come in neoprene, hard rubber and breathable materials. You can buy Boot Foot or Stocking Foot styles. The hard rubber boot foot is the most popular. You can only wade water up to slightly above the knee. If you intend to wade deeper water then the Hip Boot is not a good choice. They are useful for pontoon boats or drift boats.
Cabela's Hip Boot
2. Waist High Waders
Waist high waders come with boot foot or stocking foot and in neoprene or breathable styles. Waist highs allow you to wade water up to your crotch with confidence. Waist highs are more comfortable in warm weather and work very well for fishing from a boat and stopping to fish from sandbars. I prefer them for fishing from a pontoon boat. You don't have to worry about getting water in the top like you do with a hip boot.
3. Chest High Waders
Chest high waders also come with boot foot or stocking foot and in neoprene or breathable styles. Chest highs allow you to wade water up to a few inches above your waist. This is the best choice for deep water wading. They are harder to put on and off and may be hotter than a waist high or hip boot. They are the most popular type of wader for fly fishing.
Your fishing style will dictate the style of boot you may want. The Boot Foot is best for very cold water and where there is not a lot of walking. If you drive from fishing hole to fishing hole then the boot foot is a very good choice. If you have to hike any distance you will like the added comfort of the Stocking Foot style. The Stocking Foot also allows the choice of the foot ware as to weight, height and type of sole. Felt has been the primary sole used by fly fishers but for the safety of the fishery, hard sole boots are getting very popular.
Please Note: I am not endorsing the Cabela's equipment over any other. The pictures are for illustration only.
Cabela's Waist and Chest High Waders