I think that it's a brilliant idea for you to have another pup and playmate for your little guy. You sound like you're ready, know the breed, love the breed etc. I'm quite new to having 2 dogs, i've only ever had 1 at a time before. I must say; it's brilliant!!! I love watching my girls play, chase each other, steal each others toys. I now find myself wondering what it would be like to have 3 lol.
Whether you get your new pup or wait a bit longer is really for you to decide. You know your pooch. If he's still silly, boisterous and not toilet trained i would wait. If he is starting to be more obedient, socialized around other dogs, then there's nothing wrong with getting one now.
In re. to standing him...i wouldn't. I'd put my name down for a pup at the breeder that you got your first pooch from. Another option is like 'Occy" said; an ex-show dog.
Either way, you'll love having 2 dogs and your current pooch will too.
Let us know what you decide. Good Luck!
PS. I'm no expert.