@Vikas
If the van noticeably rides like [censored] and just hops over everything, if the ride feels uncontrolled, if railroad tracks make it fly up in the air, if driving it gives you a headache, then your struts are shot.
In that case, anything would give you an improvement over what you have. You are likely riding on the original struts. They wear gradually, so you may not notice the difference now, but once you replace them it will feel like a new car again and you *will* notice then.
Monroe Quick Struts and Gabriel ReadyMount are great for OE replacement. Both are currently on rebate until the end of April when you buy four.
For the rear shocks, Gabriel has two different shocks available for the Ody: A black Ultra shock (which is the same kind used in the ReadyMounts up front), and a white Ultra Truck Shock. If you buy Gabriel, go with the truck shock.
Monroe is a good choice for your application, but I'd go with Gabriel if the price difference isn't that much.