The Afv-club kit is great. Comes with interior. (I left the upper hull loose so I can show the interior. I should get some photos of it too!) Although steering bars are not included, academy kit is better in that area. Also, I heard that academy has a little better suspension and two different types of road wheels. Afv-club supplies only 1 kind (solid) and they have hollow backs. Not a big problem, unless you're a nitpicker. They could be easily filled, and aren't so visible after all. You get decals for six different machines and a choice of British or Canadian tool arrangement. Afv-club's kit comes with an alunium barrel, which is superb. No risk of sanding the barrel oval!
And then about the decals. If I remember correctly, only British used the Achilles (it was an M10 with the cannon changed to a British 17 puonder anti-tank cannon). It looks like I used the only non-British decal option with my kit: 1st Anti-tank Regiment. Polish 1st armoured division.
The other choices are:
93rd anti-tank reg. Royal artillery, 5 Corps: Italy 1944
British 1st army corps, Normandy 1944
75th Anti-tank reg. Royal artillery, 11th armoured division. Belgium 1944.
Royal Canadian artillery 4th anti-tank regiment. Netherlands 1945 (notice that this one has the Canadian tool arragement)
21st anti-tank regiment Royal artillery, Guards armoured division tank destryoyer battalion. Netherlands 1944
Check out my account at photobucket.com to see how they look. (that writing and drawings on the Canadian decal diagram are just my notes about Friul track I used. They come with straight and curved links and they have to be placed correctly in order to get the tracks to look right.)
I made the rust effects with Life color rust wash. It's an already thin rust-colored wash. The same effect can be achieved with washes with different reddish browns. Burnt umber could do the trick as well. Life color rust is great because the pigment deposits on the bottom of the jar and you can scoop out the thick pigment and apply that directly.
A vinyl mask is thin flexible film cut into shapes that you can use to spray on markings with an airbrush.
Take a look at those scans and tell me which one you like.