Right, If we only get one pick, I would go for 109G-2. Reasons are better speed and climb to match P38 and Spit IX, and can carry gondolas, which can help for buff hunting (they could introduce B26s and Lancs). Not to mention it can also carry a 250Kg. bomb.
If we can get two choices in, then Ju88 AND 109G-2. I love the 109F4, but wont make sense given what we are against, and our strategic needs.