@Taz
What do you want your Classic Amiga for?
Is space a premium in your home?
Do you use a monitor with your Amiga?
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I would say that 99% of Retro-Gaming users would be satisfied with:
A1200 Desktop
68030@50MHz with 32-Meg RAM + SCSI module
2.5" IDE hard drive
SCSI CD-ROM
PCMCIA ethernet card
Optional Scandoubler / LCDTV
It takes up very little room, very portable, just sling it next to the TV in the livingroom!
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As you already have an A3000 (without gfx), you like it and you just want to go "AGA" then:
A4000D 2Mbyte Chip / 16Mbyte Fast
68040@25MHz+ (Perferably one that takes SIMMS)
3.5" IDE drive
IDE DVD-ROM
Optional GFX card (preferably with scandoubler) / LCDTV
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I think you could be happy enough with a cheap A4000D to be able to sell your A3000 to help fund the purchase.
Remember that the A3000 has a built in AMBER de-interlacer / Scandoubler and that an A1200 or A4000 will either need a scandoubler or a gfx card to work with a normal monitor. HOWEVER it can be cheaper to buy a new portable LCDTV with RGB SCART input.