Rashid's batting, rather than his bowling, is doing the impressing at the moment, but certainly a lot of people rate him highly. Munday also has a lot of pundits expecting big things, but at the moment we're dealing with potential, not the finished article in all the cases quoted above, and if just one or two of those five mentioned push on to challenge Monty, then I'll be delighted.
At the moment, I'd stick with Swann in ODI cricket. As for Middlebrook, I think two years ago he may have been a genuine contender, but he has been less impressive this season, and his batting has often gone off of the boil as well. I'd suggest that his place is under threat at Essex - presumably the only reason he retains it over Grant Flower when we are at full-strength is the fact that we lose money from the ECB when Flower plays.
Foster has proven over the past 18 months that he is becoming more than just a closer in one-day cricket - batting higher and higher up the order and contributing important half-centuries. His keeping is exceptional, and he is simply in a different league to the likes of Ambrose and Mustard. I think with Bell and Wright struggling at the top of the order, you could make a justified claim for Matt Prior to play as a specialist batsman in an opening role.
I was in no way suggesting Middlebrook for England. I'd be horrified if he got called up. Grant Flower is another canny bowler.
I couldn't see Foster batting above 7 in international cricket, although he'd make a fine no.7. However for the team to be balanced with Foster keeping we'd need a big hitter at no.s 6 and 8. Flintoff maybe at 6, but I'd be loathed to go for Mascarenhas, but we'd need someone with his explosiveness.
For that reason, I think the team is best balanced with Mustard, not a particularly good keeper and not the best batsman, but the best at performing the role of pinch-hitter.
I think Read is vastly over-rated. He was originally picked for his batting, but the legend of his keeping has grown with every match he's missed. He is a very conservative keeper and wouldn't go for a lot of the catches that Jones and later Prior put down.