The Abu Garcia Orra S has an alloy frame, it is not plastic. The components are also pretty corrosion resistant with stainless steel bearings, main shaft, and other components. It's a great reel and comes with a braid ready aluminum spool and a spare spool for mono, but you can tie mono to the aluminum spool. I use mine almost every time I go fishing. The Pflueger President, as mentioned, is also a great reel. Very smooth with 10 bearings but has a graphite body and rotor. You may see this as a negative but I do not. Of the two reels I prefer the Orra S.
I do not saltwater fish but if you plan to do mostly saltwater fishing then I would more than likely go with the reel that is made specifically for saltwater, the Penn. If fishing freshwater then the Abu Garcia Orra S has my vote. My opinion is probably a little biased as I use a ton of Abu Garcia gear, but I have had no quality issues and their support is top notch should you need it from what I have read. They are also quick to respond to the emails I sent them with product questions.