SRM450's are great, go for it! V1 and V3 are best, I think 2014 would be V3.
Monitor-wise, have a look at 10" active speakers that can be put on their side. Behringer, Alto, theBox will all be good enough and, new, are like £100-150 each. Just remember to turn the bass down on the EQ to make the vocals pop.
You'll probably need to buy new stands within the year if you use them regularly. Might be worth spending a bit more on Quiklok or something instead.