We've also got a Hamax Sleepy, which we're very happy with. It's easy to take on and off (just take the saddle off and pull/push the seat up/down), so once I've bought another fixing attachment, we'll be able to swap it between bikes quite easily. It works on a cantiliver basis, which has the added benefit (which I hadn't thought about) of being more comfortable for the child, as the cantilever absorbs some of the bumps. The other advantage of the cantilever is that you can still use the back panniers if you've got them, plus you don't need to upgrade them to take the greater weight of the seat. It does mean that when you're not using the bike seat, you do still have the fixing bit on your seat post - but that's not a big deal.
The Hamax also has some good safety features: adjustable foot rests, a good five point harness, and moulded "grabs" at the sides for the child to hold on to.
I'm not sure how essential the "Sleepy" bit of it is, ie the recline, as ds seemd to be able to go to sleep in it without using it! The size of dh's bike meant that his saddle is set very low, which meant that we couldn't get at the (very easy) recline mechanism without taking the saddle off. That shouldn't be so much of an issue when we get the attachment for my bike. The cheaper Kiss, without the recline may be adequate - although if your ds is only a year old, then the recline may be useful. But anyway, I managed to get the Sleepy for £50 this Christmas (reduced £10).
Before buying a seat - especially those that using a fixing mechanism rather than the back pannier, or if you already have a back pannier, check that your bike is suitable. My dad had quite a struggle getting the bike seat onto dh's bike (bike plus child seat was dh's Christmas present) and dad thinks he's also going to have difficulty getting the fixing attachment onto my bike (but I have every confidence that he'll be able to do it!). The "problems" are not serious, just awkward, such as how to fit the fixing mechanism around/over/between the mudguards (which my dad insists we have) and the panniers (which I need as I've started to cycle to work). The problem with my bike is a bit more serious - because it's a mixte frame, is there enough room on the saddle post to put the fixing mechanism?
Cycle paths around Edinburgh are excellent Janeway, so I'm sure you'll have great fun cycling together as a family! Maybe I'll see you later this year on the Pedal for Scotland Glasgow to Edinburgh cycle ride!