Hum, for German, Russian A/C, I recommend the HobbyCraft kits. They are cheaper than the others but very comparable. Im talkin about Tamaya and the other Japanese kits. Dont buy the Hobby craft Do17 or JU-88 (they are JUNK). All the others are good, the corsair is dam good. Basically HC kits are as detailed as Tamaya kits cept for cockpits, seperate flaps, maybe the gears here and there. They are under 20 bucks, like 14-16 bucks. Beyond that, most 1/48 scale kits today are good. Ultimate cheapo is 1/48 WWII revell which mostly are 30 year old kits (under 10 bucks). Fujimi kits are a ripp off. My favorite is Tamaya, Excellant, fair pricing for what u get. Everything else is more expensive, detailed as heck but worth it if you want it.
"Revell/Monogram PROmodeller" is good also but the pricing is kinda wierd. Sometimes its fairly priced, other times its a bit expensive. Its good though. The only bad PMod kit (not really bad) is the P-40. They didnt do anything to update the kit, just added a pilot standing and jacked price up to around 20 bucks. Its still good but there are better P-40 kits out there.
The Otaki or ARII kits are junk. 11-13 bucks.