Swim skins

I'm going to be swimming in Greece in the Aegean Sea in June, and doing a river race in MD this May.  I'm not interested in speed - but protection from sea lice, jelly fish (not likely this time of year) and anything else that might be in my vicinity.   I was planning to swim the May race with a sleeveless wet suit - I purchased a long sleeve one for Greece, but now I see that the water temps may be too warm for a wet suit so I am looking at swim skins. 

My question- for swimming 1.5-2 miles in the morning and afternoon, considering comfort and bio needs- would you recommend a swim skin that is sleeveless and short legged (up to knee) - or a full body long sleeve, long leg pant?  And any recommendations of lower cost options/locations to consider? 

Thanks -