19 Jan 2007 at 04:28 - 7
I think it is best if you rethink your upgrade strategy. Upgrading incrementally at the moment must be planned out before buying anything.
I was in a similar situation about a year ago (and right now too). My motherboard died and I needed a replacement. It was an AGP/DDR1 board - the same as yours. Your AMD 2400+ is probably Socket A (462), which is equivalent to my Socket 478 P4 in terms of generation.
Since I was on a budget as well, I picked up a Socket 754 Sempron, 1 GB of DDR1 400, and a motherboard with integrated graphics (Nvidia 6100) and a PCI-E slot. Total cost: less than $200. Later put in a 7300GS because I got sick of the onboard one, bumping the cost to maybe $250. I'm planning to keep this till DX10 cards and games become more mainstream.
Now let's see why I did what I did. Socket 754 was already old a year ago, and upgrading to an old platform usually doesn't make much sense. But, I kept my system for a year already, and probably will for another. That $250 upgrade carried me for two years, making it a pretty reasonable investment. Another thing I did was pick a PCI-E motherboard. I didn't think I'd buy a new graphics card, but I'm glad that I had the option to. If I had chosen an AGP board, I'd be spending more money on an outdated standard. Sure, the 7300GS isn't worth anything if I upgrade now, but it might come in handy for troubleshooting a newer system since they only take PCI-E cards.
There are several choices for you, but I only recommend two: 1) don't upgrade anymore and save up (cost: $0), or 2) upgrade to an AM2 or Conroe system (cost: $500+)
Socket 939 is a bad choice since you'll be buying DDR1 memory that cannot be used in a newer system. Unless you actually plan to keep that system for a foreseeable future, don't do it.
A "hybrid" system (one that supports both DDR1 and DDR2 memory) is a bad choice for compatibility reasons only. Assuming it all works well after you put it together, you can get a Conroe (about $200) with one of these "hybrid" motherboards (less than $75). That way, you can keep the new AGP x1600 card and you'll end up with a decent system. Again, there's two assumptions: that your memory works with the motherboard, and that the memory doesn't bottleneck the system. I don't recommend this because it might not work, but when you upgrade later, you can re-use the processor you bought.
A cheap upgrade you might consider would be adding a DVD burner. The $30 you spend here won't make your computer any faster, but it's sure useful and re-usable when you buy a new computer.
Again, just to reiterate, I don't recommend buying any DDR1. Memory prices are pretty high now, and any DDR1 that you buy will be useless if you upgrade your motherboard again within the next few years. DDR2 may be more expensive (for the same amount and comparable quality), but at least that can be used again until DDR3 becomes mainstream (whenever that may be).