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I can only speak for Hahn Racecraft. They are very professional and have great customer service. They also want to help you with your car and make recommendations for making it go fast. Hahn Racecraft doesn't just want a check, they do want to help you.
When I ordered my Hahn Stage II kit, I too was a little leary about their payment system and sending $3,500 by mail. They do not take credit cards for turbo kits - they must all be prepaid. You do have a few options money order, certified check, or a wire transfer. I took the money order option as I wanted written proof that I sent them the money. You can also do a check on their business practices by visiting the Better Business Bureau website. It will tell you that they have an outstanding rating.
I know that Howell automotive does allow you to put a turbo kit on a charge card. However, from posts that I have read, it seems as people sometimes do not get the right parts the first time - some kits are missing items or the wrong fuel kit is sent. I would personnally recommend dealing direct with HRC, even though it may cost more, to avoid problems. For example, when I received my kit all the parts were there but when I had to install the intercooler, the silicone sleeve to join the intercooler to the intercooler piping, I had a problem. The silicone sleeve was the wrong size and wouldn't fit. I called Hahn, Brad asked if he could look up my paper work, investigate the problem, and call me back. He called back a half hour later saying the correct part just went out the door. I got it in three days at no charge. (It turns out that they made a change to their intercooler design and didn't realize that the sleeve wouldn't fit.) That's a company that stands behind their product.
I ordered my kit from Hahn and received it in three weeks. It also depends on how fast you get the money to them. I sent the money orders the same day that I ordered the kit. The faster they receive your payment, the faster they will get your kit to you (if they have everything in stock - I had to wait a few days for my intercooler).
As far as accessories for the perfect installation, this depends on whether you just want your car up and running with the least cost or do you want to have the best right from the start. I chose the following accessories to make the Hahn Kit better and more reliable (I am very cautious in my setup). The parts are listed in priority (first one would be the first upgrade I would do if limited by money):
Prices may not be accurate (don't have my receipts in front of me) just use them for an estimate.
A/F gauge (both of these gauges are a must for proper fuel tuning) EGT gauge (approx $70 for A/F, $200 for EGT) Vortech SFMU with optional hard spring $300 Missing Link ($50) Walbro Intank Pump 255 lph HP pump ($90) (if you get the HRC kit you will want this pump to lower the Inline pump noise)
I would recommend installing the kit yourself as it will allow you to learn the system and what to fix when problems occur. If you do have a shop perform the install, you will want to monitor the first couple of weeks for any leaks - both oil and fuel. You will also want to tighten up all clamps on the piping after the first 200 miles or so. Once the kit is installed watch your A/F gauge and EGT gauge under boost. Temperatures over 1600 degrees are not good - I prefer to stay under 1500 degrees. Also, you always want to remain in the rich section of the A/F gauge under boost.
I love my kit as it was one of the best upgrades I have done to my car. It definitely improves performance and you will not believe how much power the car has the first time you experience boost. The before and after seemed like a was driving two different cars.
Hope my long response helps, Kurt

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