All of the gliders you mention are good. You're not oversized so you should be comfortable in a Libelle. The DG's and the LS are fine ships but there is the service contract - I don't have a problem with it (my club owns a 300 that requires the contract and a 505 that doesn't) but it seems to upset many people. The 19 would be my preference, mostly because I think it's the prettiest of the bunch:-)

More important than the model is the particular glider. For example I love the ASW-19 but if the choice was a beat up 19 with a bad trailer versus a cherry Standard Cirrus in a Komet/Cobra clamshell, I would go for the Cirrus..