I want a baitcaster that can last in a salt water environment (with proper maintenance of course and a preservice) and can sling relatively light lures (1/4oz to 1/2oz). I was looking at the daiwa coastal, shimano tranx 150/200. Any others I should look at? The daiwa alphas air TW seems nice but kinda pricey and I am not sure if that would last in salt water. 

I only fish freshwater, but I know Abu made a Revo 3 & 4 Inshore model.  You can still find new ones on that flea bay site.  A Revo 3 new for $105.50 + $10.15 shipping.  The 4's are more expensive

I have had a Diawa Coastal 200  and the 150 for a few years now.  I have used them both saltwater, and bass fishing.  Both cast light lures well, and have held up under constant saltwater use.  They also get used every time I go bass fishing and perform well fishing everything from small plastics, to A rigs.

       I prefer the older 200 model over the newer SV 150.  Both hold approximately the same amount of line, despite the name difference.  I can cast further with the 200, but I have no idea why.  I have landed many Jacks, and other saltwater fish in the 30 lbs. range with no difficulties, and they are both as smooth as the day I bought them.  I use them on the same rods, I use Tat CT on, and honestly I don't notice any difference between the coastal, and the Tat's when casting bass tackle.

      I don't know the technical specifications, making the Coastal, a saltwater reel, but I can say they both hold up extremely well in the salt. 

        

I have 4+ salt years on a Lew's Super Duty, just needed to replace cathodically coated magnets this year for onset of corrosion.  Also bought a second. 

The most important thing to remember is that metal products of salt corrosion are more corrosive than the salt itself, so you don't want salt rust spreading through your reel. 

 

For light lures, I'm pretty floored with Super Duty G - can't explain why this reel out-casts most others with 1/8 oz except for the lightweight clean spool. 

What you find with most "Inshore" modified reels, they add-on a heavy centrifugal brake to the spool for a dual braking system for casting very heavy weight, and they need it because of the added weight of the dual braking system (the added spool weight complicates itself).  Super Duty G blows them away, and most everyone I know fishes Super Duty inshore. 

 

I'm fishing Daiwa Zillion modified for ML, even magnesium Steez to a limited extent modified for salt BFS.  Higher-grade Daiwas all have Magseal drive bearings.  I use salt-rated unshielded spool bearings, because every time you oil them, you're essentially flushing them. 

Most reels are good for salt if you rinse and maintain them properly. 

 

My bud uses 2- Shimano Chronarch G's in the salt all the time and just loves them. I use 6 of them in my Florida kit just in case he talks me into inshore a bit. Brian.

The BPS Inshore Extreme is pretty good for $100, it has dual brakes.  With 7ft rod and 15lb Berkely Fluroshield line it seemed to cast a 1/4 Yo Zuri inshore popper just fine. 

I've been using a Quantum US300 since the ought 2000's.

I've also in the past few years have been using Daiwa CC80's exclusively in salt the past couple of years.

 

After every outing I rinse down all my gear, especially the reels. Wipe with a clean cloth and use an 18v leaf blower to blow out any standing water where the cloth couldn't get. A drop of oil on the worm gear - if needed - as well as spool bearings. GTG! 

 

I open the reals on occasion and you couldn't tell they were used in salt water.

Get yourself a Shimano Calcutta B.   They are the toughest reels made.  These reels can handle everything from two pound bass to 100 pound tarpon.