As I see it the ESV and the NASB are very similar. Either are a good choice. I just got the Reformation Study Bible in ESV and it's a great resource.
I agree that the ESV and NASB are very similar; at least, they read very similarly.
The NASB is considered by many to be the most accurate, literal translation in English at the moment, but I have
no qualms using my ESV Study Bible still and I'd still recommend it for someone even if they only used the resources within it.
The ESV Study Bible was my first study Bible. I'd started my walk with a King James Bible and bought the ESV Study Bible at the same time. I soon swapped over to the ESV.
As far as binding is concerned, I honestly wouldn't worry too much. My main problem with the Publish, Crossway, is that their nicer bindings aren't very reasonably priced at all. You can buy a beautifully bound R L Allan Bible for quite a bit cheaper than an Heirloom ESV, for example.
Mine is just a hardback. When this one has had it then I'll just buy another hardback. If you're in the U.S. then they apparently have them on offer quite regularly on Christian Book for about $20.
It also includes a code you can redeem online and you create an account and have all the Bible resources online as well which is a nice touch.
As far as the bulk of it goes... It's quite large. It's one of the larger Bibles I own, thickness wise.
Personally I'd take a smaller Bible that's just a text block(I have a Cambridge Pitt Minion) and a A5 notebook and pen to take notes in and then go over them when you get home