It relay depends on the size of your list ! If you have over 20,000 subscribers then I would go with Aweber ! If you only have a little list then use anyone but when you list starts to grow then you are going to want to get with aweber! I have try most of them and I use AWeber & Constant contact but I love AWeber the best.
If you are looking for cheap service without using your own server,you can try to search indian email marketing service.pretty cheap