Stir Plates and Flasks

[Qs]

I want to get a stir plate and flask as I'm currently just shaking a demijohn every now and then for my starters.

I'm looking at one of the stir plates from there guys here here. The difference in the 2 plates is that the cheaper one can do 2L of starter and the more expensive can do 5L. So I'm wondering if I really need a 5L flask or will 2L do? I'll probably want to do the occasional lager so is the 5L flask essential?

Also where can you get 5L flasks?

[nigel_c]

Get the bigger. You can boil about 3L of wort in a 5L without a boilover. You'd be doing well to do the same with 750ml in a 2L flask.

[Leann ull]

What he said, homemade stirplates are the best as well

[Qs]

I was gonna make one but everyone is asking me if I want any homebrew stuff for my birthday so I'm gonna be lazy and just get them to buy me one.