Kool, I wont offer my services (although I am a dandy developer heheh)
But just some advice with e-commerce packages I have used in the past.

WorldPay - rip off and wouldnt touch them.

PayPal - on the expensive side, however they have been in it a while and I have successfully used them a few times if the customer is willing to pay their premiums. They are easy to set up

Secure-Hosting - a lot cheaper than PayPal and as easy to set up, but there are some pitfalls.
If you can go to credit card payment page on their gateway and stop the payment process at their server (this means your admin has to log in with their secure-hosting account to see the successful transactions, or they can get emailed to you when transaction is complete)
But you should bear in mind recently I have a situation where I need to come back to my server after a successful transaction to automatically complete the status of stock and orders etc.
This is where the trouble lies with secure-hosting because if you set a session, and pass something out to expect a value back (like a GUID you saved against the session ID in a DB temporary table or something) then I am now hitting times where the values are getting lost in their systems. I dont know if it is on certain browsers or if the user hits "Submit card details" twice or something, but I get back to my complete transaction page with no session ID and no GUID and my system cannot complete the transaction that end. The point I am getting to is their support have basically said it isnt their problem and wont look into it, which I wasnt too chuffed about. So my system has to expect about 1 in every 30 transactions to fail at the moment even though their account says the user did pay.

Google checkout - I havent actually used it in any websites yet, but have had a play around with it in the sandbox and it looked very nice, and very user friendly (enter details once, and then can be used across sites much like paypal only cheaper, free even for 2008 if you use AdWords).

Datacash - I had to write a dotnet payment system and a MIVA payment gateway for Datacash. That was quite a mission, but datacash do give you absolute full control over card validation, although I did need my own SSL for card details collection, datacash merely processed the payment and gave a reply of payment accepted or rejected.


Phew, thats my two penneths worth, let me know if you have any questions.


L