Definitely go to the sling meet, it will give you the chance to try out lots of slings. Sling users as a general rule LOVE converting people and will gladly let you try on their slings and show you how to use them.
There are lots of different ones but you can easily narrow things down.
I wouldn't bother thinking about a stretchy wrap since your baby is a few months old so you could consider a woven wrap. There are lots of makes, lots of beautiful fabrics etc but they don't have to be hugely expensive and you can get a very good one for £25-£30 if you are on a budget (from someone like Victoria the sling lady) or you can spend up to a couple of hundred and enything inbetween.
You could get an ergo or patapum type which is quite structured. If buying an ergo be very careful as there are a lot of fakes around.
Or the is the mei tai. Again lots of brands etc. The are a bit more structured, less wrapping involved. You can get them with straps which you wrap and tie or you can get them with buckles. Some have a buckle waist and then you tie the shoulder straps. Again huge variety of cost but you can easily pick one up for £40 or so.
All are great, all are comfortable. It just totally depends on what you feel happy using which is why it is best to try them out. I love wraps best personally and have wrapped all my dcs but my 3rd isn't so keen any more so I've sold my wrap and bought a MT.